Dropbox has released an update to its popular file storage client adding support for recording and uploading HD video on the iPhone 4. Dropbox 1.2.4 allows users to upload videos recorded within the app on an iPhone 4 in full HD resolution, although videos selected from the photo library remain limited to 640 x 480 due to iOS API limitations. Quality settings in the update now also affect videos selected from the photo library in addition to thoseā¦