File lock

Avielos When uploading a file, a 'path/conflict/file' error like this indicates that the upload failed because there was already a file at the specified path. That can occur whether or not the file is "locked". You can find more information about this particular error, as well as the others, in the documentation. You can find that here for the /2/files/upload endpoint itself, which is what the SDKs use as well. (It looks like you're using the Python SDK, so you can also find the Python SDK documentation here.)

As Здравко mentioned, you can control the conflict behaviors using the parameters, such as mode, autorename, and strict_conflict. Refer to the documentation linked above for information on those.