See also photos in the cache, if you see something awkward (broken images, crazy file formats etc) do the same as above for them too.

Delete them also from the 'recently deleted' folder in your library. Note their dates (because this information is lost).

Export them from your library 'as unmodified originals' (file menu) to a temporary folder that you will create for this purpose.See especially all videos starting from the oldest and try to locate their respective originals in your library.Open upload cache according to leonie's instructions (using 'find' etc).Thanks to leonie's post here this is the order of operations and it needs a lot of work: Note that my Mac has the library exactly as I want it (not the iCloud, yet) and the last thing I will do is to purge my Mac's library and wait for the iCloud's uncorrected one to be downloaded back to the Mac. Checked for 'Problem photos' - I created a smart album with all the photos that cannot be uploaded to the iCloud - guess what: it has zero files inside.

Pause/resume - I've done it for half an hour or so, still no uploads, still no update of dates in corrected files.

Changed WiFi - I read somewhere that some routers have custom ports settings due to other hardware at home, so I tried my other WiFi (yes I have two).

Waited - may nights the Mac is on (only the screen is off) and always next day no progress has been made despite the fact that many photo demons show to have been working all night in Activity Monitor history.

Furthermore, my mobile devices have many videos with uncorrected dates - they all show up very recently on the timeline, whereas they were created much earlier (and their dates were painfully corrected in the Mac library). and I was about to enjoy their content from my mobile devices, but uploading has stuck to 2,726 remaining items. I have some 78,000 pics and 4,700 videos which I copied to my Mac Photos library after weeks of work, fixing their dates, converting some old formats, grouping them in albums, adding keywords and descriptions, etc.

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