It does work but on my phone it isn't clear at all.
Sometimes mobile phone networks will deliberately degrade the quality of images to make them smaller, so you don't burn as much of your data allowance.
The images posted on the forum are clear for me on WiFi on an iPhone; the line drawing of the wall detail above is 1164x768 in dimension and 191kb in size, and a JPEG. If you get info on what you see and it's smaller than this it's likely that somewhere between diynot's server and your phone it has been re-compressed to be smaller, by throwing away detail
JPEG isn't a great format to use for drawings, screenshots and other images where there are sharp changes in colour and contrast between adjacent parts because JPEG was designed for photographs of things in the world and relies on gradual colour changes, meaning relatively large blocks of the image can be smoothed to be similar colours without the eye noticing, throwing away detail and making the file a lot smaller. Phone networks hence sometimes take the opinion that jpeg can be compressed much further because the user won't really notice or care
This unfortunately tends to destroy line art and text, blurring them out into blocks of the same colour
I am not sure how I work out the internal floor area from my architects drawings
It's written the drawing; 22.9sqm for the lounge and roughly two lots of 2.7sqm for the en-suite and the kitchen. Critically, it's less than 30sqm and a metre from the boundary, so it's clear your architect has targeted structure building regs exemptions in that regard.. It appears to contain plumbing and will likely need regs approval for that
The foundation and wall buildup is also depicted in the drawing, and very similar to FMT's design