You can check all personal .docx files and shared .docx files that you can edit. If you can't see the menu bar with the Acrolinx icon in a shared document, it's likely that you're not allowed to edit.
Some of the features you know from your Office Word installation work differently in Microsoft 365. This affects how Acrolinx works.
For example, Acrolinx doesn't work consistently when you turn on "Track Changes." We recommend that you turn off "Track Changes" before you upload a file.
When you check certain types of content, Acrolinx can't highlight issues or automatically insert suggestions. In these cases, you'll see a padlock in the Sidebar cards.
This happens for issues in:
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Shapes
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WordArt
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SmartArt graphics
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Endnotes and Footnotes
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Fields
In Microsoft 365, Acrolinx can't check content in charts, comments, alternate text, and headers and footers.