The ID described in the FilesFileMetadata here. Can I use this ID to identify a certain file in my dropbox through the API without fail?
E.g. If I use this ID with a webpage where I can add 'notes' to the images, save these notes in a database linked to the image ID's; will my notes still be linked to the correct images even in 10 - 20 years?
The 'id' is specific to Dropbox (and not embedded in the file) and is a good way to identify files, even as they get renamed or moved. I can't offer a long term timeline exactly though, but the 'id' is part of API v2, so I can say that wouldn't remove it without at least providing advanced notice (as doing so would be a breaking change).
