I have no problem on my iPad and have answered this problem on another thread. This is my reply copied and pasted across to here. I wonder whether you did as I did when first trying to upload - I didn't realise that after tapping the 'select' box I then actually had to choose where to select from. Anyway, the instructions: I hope I've not missed anything out:
Take a photo in the normal way on your iPad then go back onto this forum.
Tap the tree icon at the top of your posting window and then choose 'Select'.
Then choose ' Photo Library' and scroll through the 'mini pictures' of your photos for the one you want to post.
Tap on 'Upload' and then 'Save' . The photo should appear in your posting window at wherever you left the blinking cursor. then just complete writing your post as normal. You may get an off putting window of computer code come up after 'Save'. If so, just tap the message/ instruction at the bottom of the new window and wait until your photo appears (it's some sort of glitch that appeared a few weeks ago).
if the photo displays upside down you may have to go back into your Photo library to 'edit' the photo by cropping it to a bit smaller size. For some reason that seems to sort out the upside down issue.