Problems importing music into iTunes
I'm having difficulty importing music into my iTunes (I'm currently using Windows 7 and iTunes 12.2.1.16). All of my music is stored in my My Music folder on my C drive. I'm trying to import and organize it all into my iTunes. Under the File tab, I'm using the Add Folder to Library option. When I click Add Folder to Library, sometimes it works and sometimes it doesn't work. Some folders will import into iTunes with no problem, while others won't import at all and nothing happens. The Add File to Library function hasn't worked at all either.
Does anybody have any suggestions/help/advice? I've already contacted Apple and they basically advised me to sign up for iTunes Match. I'm not completely sold on iTunes Match because to use it, I've been led to believe, you need an internet connection. I understand in today's world that shouldn't be too hard to come by but it is while doing such activities as grocery shopping, exercising, traveling, etc.
Windows 7