Hi Alexander,
suddenly stopped working “Add new items to this folder” settings when adding document to document library via vLookup/Add new item.
The document selection dialog is displayed, but after selecting document it only displays “It shouldn’t take long” and document is not uploaded to the document library.
If “Add new items to this folder” is empty, document is uploaded.
The syntax should be correct – everything has worked so far. The existence of the folder has no effect.
It doesn’t work in the second tenant either 🙁
SharePoint Online, DFFS v4.4.5.53, tested in Chrome/Edge/Firefox/Maxthon browsers