Wrong (probably old) array key used for finding the source field

Please don't take over the issue @Shreya_th, at least not yet. I have all of this locally now, including tests

Pipeline containing the failure (demonstrating the bug): https://git.drupalcode.org/issue/media_fotoweb-3396820/-/jobs/228055
The MR pipeline should contain the fix and a test that is passing.

Thanks for spotting the issue. Yes, the `local_image` property actually should be removed.

There seems to be still some uses for the local_image property on the media thumbnail. That seems to be needed to be refactored/removed as well. https://git.drupalcode.org/project/media_fotoweb/-/blob/2.0.x/src/Plugin...

Unfortunately my testing is currently limited, since I have no customer which grants me local access to their Fotoweb installation and Fotoweb so far didn't wanted to provide me a demo/sandbox access to be able to properly independent work with their API and selection widget…

I see. Well, I updated the MR with the couple other instances of usage of the old config name, so please feel free to do as you please with that then :)

Using the MR on a project for quite a while. Seems to behave as it should. Thanks for the contribution @eiriksm

Automatically closed - issue fixed for 2 weeks with no activity.