According to YouTube official web site, they do support .mov format. However, at times there may be other technical issues that not everyone could understand and resolved easily. Words like encoder, codec….etc. could be hard for a Non-Tech-Savvy person.
Perhaps a better way would be to simply convert our video files to the more accepted format.
Here’s a video from Dave Andrews who will show you how by using some free software online, you can covert your video files easily.
If you prefer to read than watch you can read an article as an alternative by clicking here
For those of you who are Tech-Savvy, you may want to check out the more technical info by clicking on the following link
Have Fun Converting and Uploading