Greasy Fork

This is not a bug, but
On line 37, remove the " (double quotation marks)
Old: '"%id%-%datetime%-%medianame%';
New: '%id%-%datetime%-%medianame%';

The " adds _ to the beginning of the filename
Real name: user-20220328_00..._n.jpg
With ": _user-20220328_00..._n.jpg

Thanks for the script

https://github.com/y252328/Instagram_Download_Button/commit/f5aa652554e58d3d8c7a738f7228f6c7b63fa344

Updated, thanks!