Markup in Files on iPadOS corrupting PDFs

I have the same experience. I didn’t do anything suspicious. I just edited the files as usual, then suddenly one day after editing, the file went corrupted. So sad at that moment because it took me 1 month to go from just a few MB to nearly 1GB. I called Apple Support with the only purpose is to find solution to recover the file. But no helpful solution is given. I accepted the fact that I lost the file. So disappointed because i had just bought an iPad recently just to note everything for my studying, but if the files keeps corrupting like this, i don’t know what i buy an iPad for.

This has happened to me several times in the last 24 hours. I've lost at least five hours of work. The problem was non-existent until the operating system updated the other day, and now my PDF files are consistently being corrupted. Additionally, it pauses every few minutes to save, which is also impeding my progress. I am working under deadline and am beyond frustrated by this situation. I purchased the iPad specifically for the purpose of marking up PDFs with the Apple pen. Frankly, between this and recent changes to the pen's weight, I'm losing confidence.

I have had several very unhelpful conversations with Apple support in the last 24 hours over this very issue! I feel like they have been gaslighting me about my corrupted files and the fact that they went missing. They seem to think that I’ve just deleted them by mistake. Glad to see I’m not the only one! I did not experience this issue until the most recent change to the markup toolbar. I will definitely be looking for a different application to annotate my files from now on. Disappointed in Apple on this one!

Begin with a forced-restart of your iPad - as this will often clear an isolated software issue:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

If the problem persists after performing the restart, it may be necessary to reset your iPad settings. While this reset will not cause any loss of data, as a precaution, it is always wise to ensure that you have a current iCloud or iTunes backup before performing the reset:

How to back up your iPhone, iPad, and iPod touch - Apple Support

When you are happy to proceed, you can perform the reset from iPad settings:

Settings > General > Transfer or Reset iPad > Reset > Reset All Settings

If the problem still doesn’t clear, the next step is to reset the iPad to factory settings:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Otherwise, you would be best advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page. Alternatively and perhaps easier, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:

https://apps.apple.com/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad for faults - and you can explore your available options:

Genius Bar Reservation and Apple Support Options - Apple