You can upload them to imgur.com, just go to
www.imgur.com and then click the "Computer" button on the right-hand side of the page, then browse to the file you want to upload like you normally would. Once you've uploaded the file, you'll see a page showing what you just uploaded and can copy the link from there.
And yes, I have disabled attachments for now. I haven't decided yet whether I'm going to re-enable them or not.