Have no USB cable available but want to share data across your devices?  That's when you need cloud-based file-sharing services. Both iCloud and third-party tools like Dropbox are helpful for you to connect your iPhone with PC wirelessly and allow you to transfer files to or from your iPhone. 

Let me take iCloud as an example.

To connect your iPhone to PC wirelessly:

Step 1. On your iPhone, go to "Settings" > [your name] > "iCloud".

Step 2. Depending on your need, enable the corresponding option. For example, if you want to transfer photos from your iPhone to PC or vice versa, toggle on the "Photos" tab.

Step 3. On PC, go to iCloud.com and sign in with the Apple ID you use on your iPhone.

Step 4. Choose "Photos" and you will see your iPhone photos here.

Step 5. If you want to transfer photos from PC to iPhone, click the "Upload" button to upload photos from your computer to iCloud. After syncing, the photos will appear on your iPhone. If you want to transfer photos from iPhone to PC, select items and click the "Download" button to save them to your computer.