I cannot copy some of the files in the Mail app by drag-and-drop method. It is strange that when a mail contains more than one file, I can drag and put it into a folder while I cannot do the same for other file(s). Such problem did not exist before upgrading to MacOS 27.
Saving all files from the top of the hidden menu of a mail is working properly, however I always prefer to drag it since it is faster rather than moving the files from one to another.
Any suggestion for remediation?