Photos "Unable To Upload" Album
There are 511 photos in this album on my Mac ... is there a workaround so that I can upload them and then see them on my other devices?
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Frequently it helps to export the photos from "Unable to Upload" and then to reimport them. This'll help, if the photos are having an unsupported image format and need converting to a supported format.
See the paragraph "If you can't upload photos from your Mac" on this page: https://support.apple.com/en-us/HT205409
Select "Unable to Upload" in the left sidebar.
Press Command-A to select all the photos in the Smart Album, and then choose File > Export > Export Unmodified Original For (#) Photos.
In the dialogs that follow, choose the file name format and location for the exported photos. Click Export, then click Export Originals.
After the photos export, make sure the photos are all still selected in the Smart Album. Then right-click or Control-click one of them, and choose Delete (#) Photos from the menu that appears.
Click Delete, then click OK.
To import the photos back into your library, choose File > Import and find the images in the location you chose in step 5.