Can't open files in secondary user account.

Hello again all!

I don’t have time to relate the whole story so I will cut to the essential details. I have created a secondary user account with same administrator privileges as my main account. I have files I have copied to a flash drive that I created on my main account and I also want to use them on the secondary account. They are all in .jpg, .png, and .pdf formats. When I view these files in my secondary account, the icons appear as blank sheets of paper and not as the icon associated with their format. When I try to open them in their appropriate application I get an error message saying the source of the file is missing. Is there a way to fix this?