Let me make sure I’m understanding correctly.
1 - You want Only videos to do to OneDrive (which really mean videos plus thumbnails of all photos) - that part is working fine as I described - correct?
2 - Then you want photos in Original Quality to go to Amazon Photos, but not the videos. This part is not working because once you select sync Originals you no longer have the slider to determine which video size to upload (which makes sense because we told Mylio to keep all originals with the switch). Right?
So assuming I’m following correctly, for issue #2 what jimre suggested might be the best path. Instead of using the “Sync All Originals” switch, use a tag. If you use a keyword, then you could also add that keyword during import of new photos (assuming a copy import here) under the advance import options.
So for Amazon Photos (which should only have Photos, no videos) your panel should look like this:
So Amazon would save any Original with the keyword “photo” in it. And no videos.
Let me know if I misunderstood something.