I'm a beginner at SQL servers, and would like to ask something to the pros as I'm not 100% sure of the answer. Is it really not possible to partition a FileTable?
No, partitioning is NOT supported for FileTable.
Partitioning is not supported on FileTables. With the support for multiple FILESTREAM file groups, pure scale-up issues can be handled without having to resort to partitioning in most scenarios (unlike SQL 2008 FILESTREAMs).