Patreon is not for actually attaching or uploading art. You can't do it through their system. The best you can do is have a link to another site (prefereably not directly to FA) that gets emailed out to your supporters. These Patreon woes fill my journals inbox.

Hmm, I see..thanks.

He's wrong, you should be able to upload stuff. It works for me.

Oh I see, thank you for your help :)

Are you submitting things through the Creations page rather than the Attachments tab?

http://i.imgur.com/R63l7lr.png

Also, attachments appear as an icon just above the price, on the bottom right of the image submitted.

http://i.imgur.com/faqWM4Q.png

Yes, I did use "New creation". But didn't appear that icon.

Hmm, what file were you trying to upload? Some files might not be compatible.

It was JPG... but I tried now, I can able to post (see) attachments too... but thank you very much for your help Dolorcin :)