Weird Upload Problem

[Dallaspottinger]

One of a group of similar photo files will not upload.  No trouble with its 3 siblings.   All parameters are the same or very  similar, taken at the same time, three will upload one will not.   I tried just taking a screenshot, saving as a .pdf, and THAT won't upload.  I've saved as smaller file size, still won't upload.   I've copied the file from the sd card again, editing the same file under a different name, and that won't upload.  Nor will a screenshot taken from that file.   This has happened on ebay and at Craigslist, where that would be the feature photo for selling an item.   Fujifilm GFX 100s, Sony SD card, imported as DNG, edited file in ordinary ways, same as the other 3 files.  iMac Studio, latest version OS.   Oddly enough, it seems to upload here ok -- 

[GoldingD]

will not upload

What is your exact version for the application?

Upload is not a word often used in LrC

Upload is more often used in Lr (As in Lr cloudy)

[dj_paige]

Lightroom (Lr icon) or Lightroom Classic (LrC icon)? What version NUMBER? (We need the version number and not words like "latest" or "up-to-date"). What OS version NUMBER? (We need the version number and not words like "latest" or "up-to-date").

Upload from where to where? What is the exact name of the function?