In order to share my videos on Instagram, I export them to a file, sync to Dropbox, open my iOS 12.4.8 device, save from Dropbox to the device Photo Gallery, open Instagram, and share the file on Instagram. This has worked for other videos made by DaVinci Resolve and iMovie.
On the iOS Dropbox app, I click on the file, then
Save video and see this error:
Sorry, this type of video cannot be saved to this device.
I restarted the phone, I exported in
.mp4 and I get the same error. With a previous video exported from DaVinci Resolve, I was able to save it and share to the Instagram app. But this video I cannot, so I assume that the error is on the Dropbox side.
For reference, here are the export settings on DaVinci Resolve:
How can I use Dropbox to save the online file to the iOS device?