Okay, regarding the quality of the photos, everyth...

Yeah the thumbnail pictures as I class them are quite low quality but when you open to view properly it looks way better, probably not quite as good as what your original picture was but not far off.

they don't upload as is. most phones now take pics with high quality and the image size is around 4mb. download one of your uploaded pics and see its compressed a lot.

Ja auf dem Handy ist es eh kompliziert, auf der Web Seite sieht man es besser und der zoom ist dort größer.

They do apply some compression... from what i've seen they don't change the resolution, but compressing images can and does reduce quality. I've never compared with original image to notice the difference... it is likely a small difference and possibly undetectable with the naked eye. zoomed in might find some pixelation or artifacts etc..

And you tap the expanded photo and it will enlarge further. You expand that with your fingers and can inspect the plant.