Saving video messages from viber to Iphone

Need some help in saving video message from viber to my Iphone. I disabled the thing that would save photos and videos automatically then, there comes a video I want to save. After loading and watching it, I press the "save to gallery" thing but it doesn't save in gallery. I tried all, restarting my phone, rebooting then turning on the save automatically thing and when I watch it again, it still wouldn't save.

I would appreciate your suggestions. Thank you!!! 🙂