Downloading pictures and videos
When friends send a video or picture via text it takes forever to download
iPhone 11, iOS 16
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Re: "When friends send a video or picture via text it takes forever to download"
Wondering if your iPhone has enough memory / storage free for the new attachments:
Eg: An iPhone needs at least 8Gb free in which to operate smoothly.
How to check the storage on your iPhone and iPad - Apple Support
If needed: See: "Manage space on your iPhone, iPad, or iPod touch” in the article below:
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
If storage space is not the problem:
Try updating your iOS to the latest version:
About iOS 16 Updates - Apple Support says iOS 16.5.1 is the latest.
if already updated: try re-starting your iPhone: (deletes temporary files, and often restores order)