can I upload the photos and documents on my Windows PC to my iCloud?

Yes! Ofcourse you can.

Follow these steps:-

First of all turn on iCloud Photos:-

Make sure that you set up iCloud on your iPhone, iPad, or iPod touch or Mac, that you turned on iCloud Photos, and that you're signed in with your Apple ID.

1. Download iCloud for Windows.

2. Open iCloud for Windows. Make sure you're signed in with your Apple ID.

3. Next to Photos, click Options.

4. Select iCloud Photos.

5. Click Done, then click Apply.

6. Turn on iCloud Photos on all of your Apple devices.

[In iCloud for Windows 10 or later, you can also choose to use Shared Albums, and customize the location of your Shared Albums folders. If you're using iCloud for Windows 7, you can also choose to use My Photo Stream.

When you turn on iCloud Photos on your PC in iCloud for Windows 7, My Photo Stream is turned off automatically. If you want to send new photos to your devices that don't use iCloud Photos, you can turn My Photo Stream back on.]

.......

Now to upload :-

*Upload your photos and videos to iCloud Photos*

You can upload your photos and videos from your PC to iCloud Photos when you follow these steps:

# In iCloud for Windows 10 or later

1. Open a File Explorer window.

2. In the Navigation pane, click iCloud Photos.

3. In another window, open the folder where you currently store the photos that you want to add to iCloud Photos.

4. Select the photos that you want to add.

5. Drag them into the iCloud Photos folder.

6. You can view the photos and videos you

uploaded in the Photos app on iCloud.com and on all your Apple devices.

# In iCloud for Windows 7

1. Open a File Explorer window.

2. Under Quick Access (Favorites in Windows 7 and 8), click iCloud Photos.

3. Click Upload photos and videos.

4. Choose the photos and videos you want to upload and click Open.

5. You can view the photos and videos you uploaded in the Photos app on iCloud.com and on all your Apple devices.