Someone texted me photos in HEIF format. I could see the images but could not save them to Gallery nor could I send to me E-mail. Personally I don't use that format when I take pictures even though it's available on the Ultra since I know not everyone can open.
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@Dobeluvr The Gallery is a specialized file utility which shows images stored on your phone. The Gallery does not contain photos, so there is no way to store any images to Gallery.
From your text, can you save them to your phone? If you can do that, then you should be able to attach them to an email after you save them to your phone.