In the Maximum Values is the setting for files allowed and size:
Allowed Filename Extensions for uploading
List the permissible filetypes (filename extensions) to be allowed when files are uploaded to your site by customers. Separate multiple values with commas(,). Do not include the dot(.).

Suggested setting: "jpg,jpeg,gif,png,eps,cdr,ai,pdf,tif,tiff,bmp,zip"
Maximum File Upload Size
What is the Maximum file size for uploads?
Default= 2048000
NOTE: the size is relative to the setting on your server