Missing lat and long from mobile on mobile website

We have a mobile website where our clients can make a report to their local utilities company. The user have to add a picture as documentation.

The problem is, that our clients require the lat and long from the picture for further processing.

1. (saving the picture first)when using picture from the gallery - lat and long are present
2. (whitout saving the picture first) when user uses the mobile camera and adds directly the lat and long are missing.

we have testet on both IOS and android - same result.

We use EXIF-js to get the meta data.

Question: How do we get the lat and long whitout saving the picture first on the users device?

Thx in advance.