This article explains which file types the Iptanus File Upload plugin allows, and how to change the list.
Why the error appeared
After updating the plugin to version 3.9.0 or newer, many users started seeing an error that had not appeared before: “Upload failed! File not allowed.“
It is caused by the plugin’s security policy, which changed in that version to restrict the file types that can be uploaded. The point of the change is to protect sites better against attacks such as arbitrary file uploads.
The whitelist
Under the new policy, the default *.* in the plugin’s Allowed File Extensions option no longer permits every file type — only a specific set. Administrators are strongly encouraged to define their own list of allowed extensions rather than leave the generic *.* in place.
The blacklist
Even with a list of your own, not every extension on it is guaranteed to work. The plugin also keeps a list of forbidden extensions, and it checks that list first: anything on it is rejected whatever your settings say.
Check an extension
To find out whether an extension is allowed by default, needs adding to Allowed File Extensions, or is forbidden outright, type it below and press Check.



Please i need help to use this plugin,
mp3 is among allowed file, all efforts to upload it isn’t successful.
I followed every steps mentioned in the previous comments, it doesn’t work. Even mp4 that i thought could give problem upload easily.
I’m using the Free one for now, please any help, i need it to work.
The problem i think it’s only with mobile phones, mp3 successfully upload on PC.
Since many people we be using phone, any help to make it work on phone will be appreciated.
Thank in advance.
I fllowed your instructions but I can’t uploaded xlsm file . Please give me solutions .
Hi, for allowing .xlsm files you should set Allowed File Extensions in the shortcode like this: *.*, *.xlsm
Regards
Nickolas