Folder Name Support for _w and _t
In OneDrive for Business it's not possible to create a Folder with the short Name 'w' or 't'.
Because the both folders ‘t’ and ‘w’ are virtual folders from the history of SharePoint and OneDrive For Business it’s part of SharePoint.
These folder names will be used in a picture library.
‘t’ = thumbnails
‘w’ = previews
Please complete the following KB Support article with this restriction.
Or, you make it possible to use this Folder names.