Why doesn't samba copy files with "?" character?

Question

linux

There is a local network and two PCs running ubuntu20.04. ext4 filesystems on both machines.
samba does not allow you to copy files with a "?" character.
As far as I understand correctly, this can happen when files are being exchanged between linux and windows, as the file naming rules are different. But in my case, the systems are the same.
What are the possible reasons?

Answer 1

Because samba implements the Windows SMB protocol, it implements Windows-inherited file system object naming conventions and the question mark character is not a valid character in a file or directory name. do not use a network access tool based on Microsoft's protocol reverser for Windows to copy between Linux systems.

Answer 2

List of allowed characters in titles:

Any combination of letters (AZ) and numbers (0-9), plus the following special characters:
^ Accent circumflex (caret)
& Ampersand
' Apostrophe (single quotation mark)
@ At sign
{ Brace left
} Brace right
[ Bracket opening
] Bracket closing
, Comma
$Dollar sign
= Equal sign
! Exclamation point
- Hyphen
# Number sign
( Parenthesis opening
) Parenthesis closing
% Percent
. Period
+ Plus
~ Tilde
_ Underscore

You can read more HERE

Answer 3

It might help