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I'm not a regular photo uploader so only just come across this.
Imgur has disabled logging in to their site from a mobile and push you to use the app.
Only... You can't get to bbcode in the app so there isn't a way to upload photos to STW.
I tried selecting Use Desktop site but no change.
Is there another way round it?
Just testing...
Share > Copy URL > paste in forum reply box appears to work fine.
Flickr has been like this forever, but their developers are totally uninterested in fixing it, at least on iOS. I don’t use Imgur, so I’ve not come across this issue.
Upload
View
Press on photo
Choose "Copy URL"

Thanks Kelron.
Nice one.
Edit: and Scotroutes
Postimages.org works fine with the added bonus it doesn't keep telling you they value your privacy.
Testing
Postimages.org works fine with the added bonus it doesn’t keep telling you they value your privacy.
Drac, do you get that with both Kelrons image and mine? I notice that we've used different methods. His includes a link to imgur. Mine is just the photo.
Only Kelron's the work around you use seems to bypass it.
Interesting Dawson's hasn't worked I see.
I wonder if Dawson used the link tool instead of img. 
Mine was just pasting the image url in the reply box, no image tags, so I assume the forum software has an auto-embed function.
Glad to see they still value my privacy.

This is my first attempt since Photopic closed.
Thanks, Drac for the tip on Postimg.
