Why do My wify setting prevent content from downloading?

OK, got it, sSee this Apple articles below:

If you see 'Unable to load remote content privately' at the top of an email

https://support.apple.com/en-us/HT212797

Use Mail Privacy Protection on iPhone

https://support.apple.com/en-gb/guide/iphone/iphf084865c7/ios

Go to Settings => Mail -> Privacy Protection -> Turn OFF Protect Mail Activity.

You need strong Wi-Fi network for download, see this Apple article:

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

https://support.apple.com/en-us/HT204051

Thanks for your feedback & you're welcome.