For the photos, this is what I have done:  First, open them up in a program like the GIMP or other program and scale/resize them to no more than 1024x768 (I use 800x600). This reduces the file size and makes them fast to load yet leaves them with enough detail for people to see. Pictures will definitely be helpful to show the problem(s).

Second, use the advanced editor (two boxes with arrow above). That has an icon for uploading pictures (looks like a framed picture of a tree). Select and upload the scaled picture. Then you can use that picture in your posts.

I hope that will provide you enough information to be able to add pictures to your posts.

As for the roof, what did you purchase? What type of roof does it have? These are questions that need an answer before anyone can advise you. Generally though, the following information may help.

If it is a fiberglass roof, clean it off much as you would the rest of the RPod. The roof will hold your weight if you need to get up there to wash it. If it is the self-leveling sealant such as Dicor, then you can re-seal it by cleaning the existing sealant with denatured alcohol. Then put down more sealant and let it flow into any cracks.

If it is a composite roof, it may be showing dirt, but if the membrane is in good shape, just cleaning it off should suffice. If it is physically torn, then that is a bigger problem. For small spots, some self-leveling sealant such as Dicor should work. If not that, then Eternabond tape may work. If it is extensively damaged, then replacement of the membrane may be needed. If you do not feel comfortable doing the work, you will need to take it to an RV repair shop. If you are inclined to do it yourself, then I'm pretty sure you can find some YouTube videos that will demonstrate the process.