Error when save in photoshop

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1: Open Lightroom

2: Find a Tiff file with layers already edited in PS but now stored in LR and do Edit in PS

3: When PS is open, go back to LR and open 2 new files for edit in PS

4: In PS, drag those two newly opened files into the already opened file

5: Now the first opened file will consist og hte original tif file and two new layer with the other files.

5: File size is about 1.8 gb.

6: Do some editing in the file, like brush tool on layer masks etc.

7: When in PS, do save or save as.

8: Expected result: File should be saved back in LR with latest changes when doing save, and file should be saved to another disc when doing save as

9: Actual result: Error "Can not archive "_7503332-edit.tif" because an program error occured"

10: Try to convert the file to smart object.  Result: Same as over, not possible to save the file as smart object.

11: Other important data?  PS and LR version is last from 8. dec.2020. PC has 16GB ram, scratch disk has 616 GB free space. Old LRC and PS versions are unistalled.

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This post has been out here for some days now, but no response. Is this post posted on a wrong place since there are no reply?  May be this is not the place to ask such issues? Is this the official Adobe place to post errors and to get answers on what to do or shall I contact others to get help?