How do I export a .dae so that textures are included when I import it? I've recently used Blender to work on a model, and I need to export it as a dae file, but after I export it, I find that the textures don't import with the model, for some reason. 

Just so you know, yes, I have these options checked. 



But, no matter what program I try to import the model into, the textures do not import.
Check the texture coordinates for your object(s) and make sure they're using "UV" and not some other coordinate system (e.g. "generated," "object," etc). (Also: If you haven't already UV unwrapped and mapped your object(s), you'll need to.)  :)