Error when saving a file

[r-groeneveld]

Hello, I sometimes get an error when saving a file into an deeply nested icloud folder. The text box says "fout bij het opslaan van bestand. Schijf vol of niet toegankelijk" which translates "error when saving, Drive full or not accessible". Well, the drive is accessible at least to other programms, and there is also a local mirror of the full contents of the icloud drive locally. Also, saving a file in an 'adjacent' folder on the same deeply nested level works well, so the error occurs not always - annoying. What goes wrong? Thanks !