Client Permissions and File-Sharing Rules for an AI Spreadsheet Service

Direct answer: Give an AI spreadsheet service only the smallest access needed for the current task, work from a separate copy whenever practical, use named people and explicit roles instead of open links, and review every change before returning the file. Treat sharing settings, AI prompts, chat history, coauthor visibility, downloads, and deletion as separate control points. The exact behavior depends on the spreadsheet platform, account type, administrator settings, and the external AI product, so confirm the current product documentation before handling a client file.

This is an operational workflow guide, not legal, tax, privacy, copyright, or financial advice. If a workbook contains regulated, confidential, personal, or otherwise sensitive information, ask the client to identify the applicable internal policy and consult an appropriately qualified professional where needed.

Why permissions matter more when AI is involved

A conventional spreadsheet share already determines who can view, comment on, edit, download, or reshare a file. An AI-assisted workflow adds more places to inspect: the prompt you type, the context the assistant retrieves, the generated response, edits made directly to the workbook, and any conversation history retained by the service. Do not assume that an AI edit is invisible to other collaborators. Microsoft states that saved Copilot changes in Excel can be seen by anyone with access to the workbook, including people in a coauthoring session. [1]

Permission inheritance can also defeat an apparently narrow share. Google explains that access applied to a folder is inherited by its files, and that an editor can share a file or change sharing permissions by default unless the owner limits that behavior. [2] In practice, inspect the file and its parent folders, not only the link you are about to send.

A simple access model for client work

Start with the principle of least privilege: a user or process should receive only the access necessary for its task. NIST defines least privilege as restricting access privileges to the minimum necessary to accomplish assigned tasks. [3] Apply that idea as a practical design rule rather than as a claim that a workflow is compliant with any particular law or standard.

Use named accounts rather than “anyone with the link” when the platform permits it. Google’s current Drive documentation distinguishes Viewer, Commenter, and Editor permissions and notes that link sharing can make a file available to anyone who receives the link, depending on the selected setting. [2] A link is a transport mechanism, not an identity check.

Build a separate working copy

For a first pass, ask for a copy containing only the tabs, rows, and columns needed for the stated task. Preserve the original in the client’s controlled location unless the client explicitly instructs otherwise. A separate working copy makes it easier to compare changes, remove temporary notes, and stop sharing the service’s workspace without disturbing the source file.

Before copying, check for hidden sheets, formulas that reference other workbooks, named ranges, comments, notes, external links, pivot caches, and metadata that may travel with the file. Removing information is not the same as proving that it is impossible to recover, so use the client’s approved sanitization process for sensitive material. Do not upload a file to an external AI service until the client has authorized that workflow and you have reviewed the service’s current data-handling terms and account controls.

Use a neutral file name and a clear version label, such as client-project-analysis-working-2026-08-18.xlsx. Keep a short change log outside the workbook stating the source copy, date received, requested operation, AI tool used, and reviewer. This is an operational record, not a substitute for the client’s records-retention or security policy.

Control the AI interaction, not just the file link

Microsoft says Microsoft 365 Copilot surfaces organizational data to which the individual user has at least view permission, and it uses Microsoft Graph content that the user is permitted to access. [4] That means an assistant operating inside a work account may draw context from more than the single workbook you intended to discuss. Confirm the active account, connected sources, and workspace before entering a prompt.

For an external AI product, verify four questions in the product’s current documentation: what data is sent, which subprocessors or connected services may receive it, how interaction history is stored and controlled, and whether the account provides an opt-out or administrator policy. Avoid placing unnecessary names, account numbers, credentials, access tokens, or free-text notes in a prompt. Prefer a redacted sample or a locally approved field mapping when that is sufficient to solve the task.

Keep prompts narrow and testable. “Create a formula that groups dates by month in column D without changing values in columns A–C” is safer to review than an open-ended instruction to “clean and improve everything.” Microsoft documents separate Excel modes in which Copilot can edit a workbook directly, plan a change, or keep responses in chat. [1] When available, plan or chat first; use direct editing only after defining the intended range and rollback method.

Review edits and coauthor visibility

Never treat a fluent explanation as verification. Microsoft cautions that Copilot-generated insights and formulas can be inaccurate or inappropriate and recommends reviewing, editing, and verifying generated content before relying on it. [1] Check formulas against a small hand-verified sample, inspect totals, compare row counts, look for changed formats, and test filters and dates.

Before making an edit in a shared workbook, identify who is currently present and whether the platform displays live coauthors or activity. Explain to the client that saved changes may be visible to collaborators. Use version history or a duplicate so that the original can be restored if the result is wrong. If the workbook is used for a sensitive business decision, require a human subject-matter review before delivery; this article does not evaluate the decision itself.

Close the workflow deliberately

Returning a file is a separate event from finishing the AI task. Send the approved output through the client’s selected channel, confirm the recipient, and state which copy is authoritative. Then remove the service account or collaborator, revoke links, delete temporary exports and downloaded copies where the approved process permits, and clear local recycle bins or equivalent holding areas. Do not claim that deletion is complete unless you have actually verified the relevant locations and the product’s controls.

For Google Drive, the owner can stop sharing, while folder inheritance may require changing the parent folder rather than only the individual file. [5] Google also documents expiration dates for eligible work or school accounts, but availability depends on account type. [2] Microsoft and other platforms have different controls, so do not transpose one provider’s steps to another.

Red-flag decision tool

Pause before upload or sharing if any answer below is “yes” or “unknown.” The tool is intentionally conservative and is not a legal or compliance assessment.

1. Does the workbook contain information the client has not authorized for an external service?
2. Is the recipient unidentified, or is the link open to a broad audience?
3. Does the requested role exceed the task, such as editor access for a view-only review?
4. Could a prompt expose unnecessary personal, confidential, credential, or client-identifying data?
5. Will AI edits be made directly to the authoritative file without a tested backup or version path?
6. Is it unclear whether prompts, responses, files, or activity history are retained?
7. Is there no named reviewer who will verify formulas, totals, and scope?
8. Is there no documented end step for revoking access and handling temporary copies?

If the answer is “yes” or “unknown,” stop and ask the client for clarification, switch to a less exposed workflow, or refer the question to the organization’s security, privacy, legal, or other qualified adviser. Proceed only when the access, purpose, reviewer, and closeout steps are explicit.

Practical pre-send checklist

Before sending a workbook, confirm that the recipient and role are correct; the parent-folder permissions have been inspected; open-link sharing is disabled unless intentionally approved; the working copy contains only necessary material; prompts and AI history have been handled according to the approved workflow; direct edits have been reviewed; formulas and totals have been checked; the output filename and version are clear; and access-removal and deletion steps are scheduled for the end of the engagement. Keep the checklist with the project record, and update it when the platform changes.

Sources and further reading

1. Microsoft Support: Frequently asked questions about Copilot in Excel.
2. Google Drive Help: Share files from Google Drive.
3. NIST CSRC: Least privilege glossary entry.
4. Microsoft Learn: Data, privacy, and security for Microsoft 365 Copilot.
5. Google Docs Editors Help: Stop, limit, or change sharing.