Original filename:
BSL Greetings & Basic Communication Quick Quiz 8 Lisa Mills Online.mp4
After only applying:
Auto Date(8)
Mode: Prefix
Type: Creation (Curr.)
Fmt: Custom
Custom: %H%M%S
Cent: [Not selected]
Off.: 0
Result was:
111634 BSL Greetings & Basic Communication Quick Quiz 8 Lisa Mills .mp4
What's happened is that the one filter has correctly prefixed 6 characters to filename, but also erases the last same-number-of-characters off the end of the filename, yet retains the file extension.
Using BRU 2.4.1.0.
No options were set that would have resulted in the loss of characters at the end of the file name.
File is on a NAS and a mapped drive letter. (Not a UNC path)
Samba version baked-in on NAS is version 4.3.11.