I strongly recommend creating a short desktop video with a narrative of the issue. I use Zoom to record the desktop. There are many choices provided by Windows. VLC is also an option.

FYI. You can point the phone camera at the desktop and create a video pertaining to a console or UI3 issue as well.

Some users provide a video without a narrative of what's going on which is more challenging because I have to keep going back and forth between the email and the video to understand. Alternatively, provide notes as to what you are demonstrating in the video. For example:Mobile device
If the issue lies with the Mobile device, phones have made it very easy to create a video with screen share.

• In iOS, creating a video is simple now. https://support.apple.com/en-us/HT207935
• Just as simple on an Android. Invoke Screen record.

If the video (mp4) is too large to send via email, use a file share service. Many use Google drive but there are lots of choices. DropBox, Box, iCloud etc.