iOS/Windows/Mac: When you need to access a file that's on your PC's hard drive without being anywhere near it, you better hope you have Younity installed on it and on your iPhone. This nifty app scans folders on your computer and lets you access them on your iPhone, without needing cloud storage space.
Install and sign into Younity and point it to folders on your hard drive. It creates a list of all the files (including subfolders). Sign into Younity on your iPhone and it will show you this file list on your phone, which you can browse in a simple explorer. If you want to access any file, tap it and Younity will stream it to your phone. You can also choose to download or batch-download certain files. It's simple and works flawlessly.
Younity also automatically sorts music, photo and video files. Plus, you can search for any file. There are also options to share a file with friends, although you will need to download the file to your iPhone for that.
The best part is that it doesn't take any space on your iPhone to keep that huge file list. You can check how much space Younity is taking in the settings, along with an option to use or not use mobile data. Hit the link to try it out.