On Android and iOS our PDFs (which we generate using DevExpress) crash after trying to save a free hand signature on the page intended for signing in the pdf. The signing itself goes well (shows the signature where it was drawn) but after confirming (saving) the reader shows an error:
The document cannot be opened because it is corrupted or damaged
On the desktop this cannot be reproduced. We have a video demonstrating the issue and the pdf in question but I don't see how I can attach those.
Instead some screenshots:
We ran some validators on the PDF but no issues were found. Devexpress asked us to contact Adobe via this forum so we hope there will be some answers. We posted a bug request with this issue as well already.