No need to worry about the yellow exclamation marks. The only cameras added to the database are the problem ones. You can also add cameras in a simple text editor if you want the yellow marks to just go away, but it has no bearing on the final quality of the model.
Also, from what I understand Reality Capture will down sample the real textures in the program to help speed up performance. If you want to see the true quality of the final output click “render” to get an image or export the model.