Answer: Because you moved the folder to another drive, the request permissions were reset. That being said, it cannot be accessed without permissions.
Step-by-step explanation:
You only shared the "C:\DenverCO" folder location. The permissions were there at one point, but once a sub folder is created and the location is changed, the permissions also change. In other words, they are reset.
Here is another example of this;
Lets say your neighbors are out of town. They forgot one important thing, such as their debit card. They call you to grab it using the key under the mat. Once you get into the house using the key, you are lost. You call your neighbors and they tell you the card is in a bedroom. However, they door is locked. You don't have access to get into the door, even though original access was granted to get into the house.
In this case, the house is the original location and the bedroom is the sub folder.
Hope this helps! :D