uploading photos to icloud

Make sure your network connection is active and try again.

See -> Access and view iCloud Photos on your iPhone, iPad or iPod touch

Access and view iCloud Photos on your iPhone, iPad or iPod touch – Apple Support (UK)

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Do more with your photos

• Transfer photos and videos from your iPhone, iPad or iPod touch.
• Download photos and videos from iCloud.
• Take and manage photos.
• Set up and use iCloud Photos.
• Reduce the size of your iCloud Photos.
• Get help with iCloud Photos.
• Check your iCloud storage.

Make sure you have enough iCloud storage.

but it somehow stuck

Get more help:

• Contact Apple Support -> Get Support (apple.com)

• or Visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.

You will first have to make an appointment due to the pandemic.

See: Contact Apple for support and service

Contact Apple for support and service - Apple Support

Have you turn On iCloud Photos?, see this Apple article: How to use iCloud on iPhone

How to use iCloud on iPhone – Apple Support (UK)