iPad pro 12.9 1tb with 800gb free cannot export to photos

Hello.

I have 30k photos and use my iPad as main driver. I've selected 9k pictures to be exported to Apple Photos (native)

I tried the "export" no conversion and export to photos library (as is) no conversion.

all files are locally downloaded on my iPad.

it start... verifies... and show "saving" and then says 3 photos of 9k cannot be exported , but there is nothing on the photos app.

using the latest version of iPad OS and LR for iPad. I have 800gb free...

thank you.

PS: I've exported 1000 once using the same process and worked. I have 3 sets of 30k photos to

upload. I am just tying with 9k as a test.