
If I understand correctly, Excel files are read-only on the Mac. It looks like you have already done some troubleshooting. I would recommend you read this article, it may be able to help troubleshoot the issue. Set or clear read-only status - Excel for Mac Thank you for using Apple Support Communities. Have a good one. Windows — Uncheck the 'Read-only' box near the bottom of the window, click Apply, and click OK. Mac — Click the Read option to the right of your name, then click Read & Write in the menu which appears. One of the possible ways to fix read only mode in Word is to change an attribute for your file. Right-click on your Word document and select Properties. Tick-mark Read-only and click on OK. Open the Properties menu again, untick the Read-only option, and hit OK. Disable Read-only mode in Word 2016 (Mac) locking out any edits until Duplicated and saved I have read that: 'If the documents that open in read-only mode were either downloaded, or received as attachments to an email message, that is the default behaviour. While interacting with different types of documents written on different platforms, you will eventually end up seeing Read Only files on your Microsoft Office program. The above solutions tell you how to change a word document from Read Only to a normal document. You can choose one to try.
How to switch to/toggle read only mode in Excel?
Sometimes, for preventing readers from changing active workbook by accident, you may want to switch the workbook to read only mode. This article will show you the detailed steps to switch to or toggle active workbook between read only mode and editing mode in Excel.
Switch to/toggle read only mode with Toggle Read Only feature
The Toggle Read Only feature can help Excel users easily switch active workbook between editing mode and read only mode. However, this feature does not show in Ribbon. This method will guide you to show the Toggle Read Only button in the Quick Access Toolbar easily.

1. Click the Arrowin the Quick Access Toolbar, and select the More Commands from the drop down list. See screenshot:
2. In the opening Excel Options dialog box, please do as follows:
(1) Select the Commands Not in the Ribbon from the Choose commands from drop down list;
(2) Click to highlight the Toggle Read Only in the commands list;
(3) Click the Add button.
3. Click the OK button to show this Toggle Read Only button in the Quick Access Toolbar. See screenshot:
4. Click the Toggle Read Only button for the first time, active workbook switches to read only mode; click the Toggle Read Only button once more, active workbook restores editing mode.
Notes:
(1) If you have never saved active workbook before, this Toggle Read Only button is invalid.
(2) When switching to read only mode, the following dialog box will come out if you have changed active workbook but not saved.
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