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I have been trying to comment on a file that was shared to me via gmail. It opens up in a read only mode and I am unable to add comments to it on my iPad.
Hope you are doing well.
As mentioned that the file is read-only, so it is not possible to make edits or any changes on the Acrobat app on iPad. However, you can make changes in the Acrobat DC desktop app.
you can refer to the article below to know how to remove protection from a PDF:
Let us know if that helps.