xF1 Unmaintained Ultimate Attachment Manager 1.0.2

what is the Function of this addon ?
1- as many want to limit attachment view / upload / download based on the user permission ...
2- limit the Size of the file based on usergroup. Working
3- exclude some of the extensions from usergroup Working
4- limit the Max image Width and height working
Working like a charm ... but notice that general behavior of xf is not sending a err msg when it not mach the limited ... it is going to resize the images

5- limit the count of the files. working
how can I make the users View some extensions files but not other extensions
... go to option -> [DH]UltraAttachment Management->Special extensions:​