[STORY] as a host, I want to get some guidance on file types & size in the image uploader, so I can choose the right file to upload
The image uploader poses certain limits in regards to accepted file type and file size. The UI gives an error message when a user tries uploading a file that does not fit the criteria. To improve UX, the image upload dialog should offer an infotext stating the supported file types and maximum allowed file size for upload.