Topic says most of it. I added some mp4 files to iTunes. I now want to delete them, but both the file or the containing folder gives and "Error Code -50" ...
You can delete files from Dropbox in order to recover storage space. You can delete files from Dropbox using your browser or the Dropbox app. If you delete a file ...
You can delete files from OneDrive to remove them from the cloud and any devices connected to your OneDrive account. To delete a file, open the OneDrive website and select the files you want to remove ...