To accomplish this, you need to have a Dropbox account ready (If you don't have one, you can easily create one quickly) and the Dropbox app installed on your iPhone or iPad.
Step 1: Open the Dropbox app on your device by clicking on the Dropbox icon on your iPhone or iPad screen (Image below)
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Step 4: After entering the folder name, click 'Create' (Image below)
Step 5: Here, again select the Options tab (Image below)
Step 6: Click on 'Upload' to upload Full HD Videos from iPhone, iPad (Image below)
Step 7: Select Videos from Camera Roll (Image below)
Step 8: After selecting the Videos, click on the 'Upload' button above (Image below)
Step 9: The uploading process may take a few minutes depending on the size of your Videos (Image below)
Step 10: Once finished, you can send this link to your friends to download to their devices and share together. (Image below)
https://Mytour.vn/ios-how-to-share-full-hd-video-via-dropbox-105n.aspx
So this article helps you share Full HD Videos from iPhone, iPad via the convenient Dropbox service.