Hello, I am wondering if there is a setting in Acrobat Reader DC that affects whether editable fields appear in a document and/or whether a file can be saved with field changes. I have someone using the full Acrobat sending me documents that require me to add my "signature". In one case, the document warns me that I cannot save changes and in that case, she saved in Acrobat with a different check box and that worked. However, another one came with no editable fields. Since she sends these to multiple people that use the Reader, it seems like it's on my end but I can't be sure.
Version is 2020.013.20074 Reader if that helps.
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By default, your version of Reader should be able to fill in fields, sign a file and save it with the changes.
If it's not possible it usually means there's something wrong with the file itself, or it was created using a very outdated method that prevents it from being saved. It can also be secured or digitally signed, which would also prevent it from being edited.
Without seeing the file and the exact text of the error message it's hard to say for sure, though.