I’ve experienced this twice and I’m pretty sure that the low storage is the cause. After you finish shooting It shows a message to free up space. However once you do it, it seems they’re not recalled from the temp cache and are deleted forever :( I shot a panorama and only two images showed up in the album. The cloud icon says everything is synced. I’m 100% the pictures were taken. The processing batch showed 10 images needs to be developed before the low storage notification showed up.