Adobe Acrobat Reader can't edit(write, draw, highlight etc.) PDFs on SD CARD

I have Samsung Galaxy Tab S6 Lite and Samsung EVO Plus 64GB microSD card. I could edit my documents in internal memory. Then I transfered my documents to external memory(SD Card). So I can't edit pdfs anymore.

I get the following warning when I try; "This document is read-only, so changes cannot be saved. Would you like to create a local copy on your device to continue editing?".

I can edit only Office application on SD CARD, but I want to use Acrobat Reader. How can I solve this problem?