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Hi,

Hope you are doing well.

Thank you for posting your query here. Please help me with few details to understand your issue better.

1. Make and model of your device?
2. Application version?
3. Do you have premium subscription? To check please refer : https://www.adobe.com/devnet-docs/acrobat/ios/en/troubleshooting.html?highlight=about 
4.  Was the document shared by you or is it shared with you? Do you have edit permission on document?
5. Is it happening with all the shared PDFs. Please make a test PDF and share it, do share your observations with us.

For more help refer to: https://www.adobe.com/devnet-docs/acrobat/android/en/review.html#work-with-comments

Let us know how it works at your end. If you have any further queries please feel free to reach out to us.

Regards

Ria