Series 3 apple watch
Unable to update not enough room on watch
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To free storage space on Watch -
Using the Watch app on the paired iPhone, unpair the watch. Then repair the watch. Doing so frees up storage space by deleting temporary files, corrupted files and then reindexing the filing system.
M1 Mac mini, macOS 12.4; Watch, series 5 GPS/cellular, watchOS 8.6; iPad Pro 2nd Gen, iPadOS 15.5; iPhone 12 Pro, iOS 15.5; TV 4th Gen, tvOS 15.5; HomePods, audioOS 15.5 and Airport Express w/ Airplay 2