Step 1
Open Share
Step 1: Open Share 
Step 1: Open Share Step 2
Pick the file and the size
Step 3
Send it
Questions
Medium (2048 px on the long side) is plenty: Instagram shows photos at most 1080 px wide. Crop to 4 × 5 first for the most room in the feed.
Yes: choose Original as the file type to send the file exactly as you imported it, or DNG to export it as a DNG.
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