Can’t view/open PDF (editaed by Apple Pencil 2) file on iPad Pro from the Files Management

Hi guys,

I have new Apple iPad Pro (12.9 inch - 6th generation) & Apple Pencil 2.

I'm using local pdf documents to write manual comments by Apple Pencil. I have created PDF file with only my comments and it has about 20 pages. It seems to be stopped to work. I can't open my document (from iPad Files Management - it still works - I can open it from Adobe Acrobat reader). I can see blinking text :

Opening in : Acrobat in canvas I can see black screen with document name and size (it has 194.8 MB).

I can't continue in editing from iPad Files Management. Sometimes .. few times per day, I can open it and see only 1st page but once I'm trying to click to other page, I can see again only black screen and again only name of document + size.

Any idea, how to fix it ? It seems to be exactly the same problem reported as :

Can’t view/open file on iPad from the Fil… - Apple Community

but your suggestions to fix it

If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open

Access and manage files in your iCloud Drive

Access iCloud Drive files from your iPhone and other devices

DOESN'T WORK AT ALL.

Thank you

Roman