If you are on an Android phone, you may not see the multi-image icon (❐) when trying to post to Instagram.

This a limitation from Instagram's end on Android (they only allow 1 image when another app opens the Instagram app).

So as a workaround, you can click "Share to Instagram" in the OneUp mobile app, so the caption gets copied to your phone, and the images get downloaded to your phone's gallery.

Then just close the OneUp mobile app, and open the Instagram mobile app on your phone, and paste in the caption, along with adding your multiple images that were downloaded to your phone's gallery.
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