When you try to send a photo or video in your iCloud Photo Library Camera Roll, you'll see an annoying popup that prevents you from sharing photos or videos with your friends. This problem happened to me and it took a while to solve this problem.
AIRDROP DOESN'T WORK | CANNOT SHARE THERE WAS AN ERROR PREPARING TO SHARE
One reason why you're getting the "an error occurred while preparing to share" message is because you've enabled low power mode and since it's supposed to save your device's battery, you won't be able to share photos from your camera roll, so you'll continue to receive the message.
To share/send photos again, Low Power Mode must be turned off in your iPhone's Settings app. When this is turned off, your iPhone will be able to send photos and videos without showing that it could not share, there was an error preparing to share.
Another reason why you are getting the error is that there is a bug in your device that is preventing your iPhone from sharing. Before you can send content to another device, your iPhone must prepare to share the content; if there is a problem during this preparation stage, it may cause you to be notified that there was an error while preparing to share. Try again later. In this case, you need to get rid of the glitch that is causing the problem.
