The ‘send’ box with the up-arrow appears on the linked site but doesn’t work on my iPad.

Hello,

We understand you're experiencing an issue with a web browser on your iPad, however, we'd like to ask for some additional details. These details may help facilitate additional responses from the community.

• What is your iPadOS version? Found at Settings > General > About.
• Can you clarify the icon you're expecting to see, and how you're expecting it to behave?
• Are you able to use any hyperlink on a website?
• Are you using Safari or another browser?

In the meantime you may find helpful guidance in the support articles below.

Restart your iPad - Apple Support

If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch - Apple Support

Regards.