Solving an Import error of a color and video volume in the Photos application on Mac. Fix cannot import items in Photo Library.
Cannot import items Unknown error.
Some items cannot be added to your Photos library because they may be in an unrecognisable file format or the file may not contain a valid data.
The Photos application i think he is better Manager for Pictures and Video, existing on Mac. Perfect synchronization with iPhone, iPad and especially with iCloud, multiple photo and video editing possibilities, simple sharing. But, it is not a perfect application in all scenarios.
I met a problem when I had to import a larger volume of photos and video (over 3000 in a single session). "Cannot import items", On the grounds"Unknown error. ” or that the elements are in an unrecognized format.

Fix Cannot import items in Photo Library (Mac Photos App)
There is no question that the files are not recognized, especially since the pictures I wanted to import were made with various iPhone models.
This import error appears after repeated import sessions with large volumes of photo and video files. Most likely is something related to the temporary file system (cache) that application Photos it does them before starting the import itself.
If you meet this error in importing photos and video in the photos application on Mac, all you have to do is to close the whole Photos application (Cmd + Q) Then reopen it and repeat the import. The error ”cannot import items in Photo Library"It will not appear.
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It worked perfectly to me. Most likely when the application is closed, the cache of previous import sessions is closed.
Ditto for me ...
It was walking well until I have the error message ... Im^Import to import .. unknown error.
even with “old photos”.
I closed, restart .. and always the error