When I film timelapse, the raw images saved are only 540p, with each file size being like 23MB. when saved in jpg, it's saved in 4K.  what's the issue??

Hello there DJPJ. I am sorry for the trouble this has caused and thank you for reaching out. May we know what is the model of the mobile device that you are using please for us to be able to isolate the said issue? Thank you.

Maybe you are looking at the preview images?

Montfrooij Posted at 9-27 22:25
Maybe you are looking at the preview images?

I think Montfrooij is right. What software are you using to view the picture.

Spark4Me Posted at 9-28 10:30
I think Montfrooij is right. What software are you using to view the picture.

I'm always right
(kidding, my wife is )