XF 1.5 upload of attachment not possible


Hey guys, your assistance is urgently needed please.

Almost 90% of my members visit my forum through the Facebook freebasics platform (freebasics does not support javascript).

Almost everything works fine for them except for uploading of attachment which does nothing whenever they try to upload into conversations or threads.

It happens that uploading profile pictures works fine.

Please does anyone knows what I can do to make uploading of attachments to threads and conversations possible as much as uploading profile picture is already possible.