Please have a look at the screen capture below.
I mentioned to use the Create Caps only once per object, as otherwise it creates internal polygons, which can cause trouble. You can of course use it many times per object if applied to separate areas each time.
Please let me know if you have any further questions.
The way a C4D file can be attached, up to a certain size, is by “zipping” it. After it is compressed as “.zip” file, most of the time it can be attached.
We suggest to use Dropbox. If that is not an option, I can provide an upload link. I do not really prefer “new” cloud option from companies I haven’t heart from, as I do not know what danger they could introduce. If I have to agree to a cookie with those newcomers, I’m certainly not in.