Postimages.org is the hosting site I use. Make sure you scale the image for message boards (it’s an option when you upload your photo) or it will be too big here. then just input the direct link into the box that comes up when you hit photo icon above (thirds from the right) and it will post the photo in your post.
I don't use the app, so I don't know if this will answer your question.
This is postimages home page that I see from my browser, not an app. The size is set for message boards.
At the top it lets you select either Upload (which is from your computer or phone) or Upload by URL (you copy the URL for the photo you want to upload).
-------------------------------- When the world wearies and society ceases to satisfy, there is always the garden - Minnie Aumônier
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