I look at Banners as being good for announcing things that people just can't miss. Something like this for example:
There are a couple of different ways you can add a true 'Banner' on top of SharePoint to highlight information.
1) Use the ways that other folks have talked about here which is things like using Content Editor web part, SharePoint Designer, ...
I know this is an old question, but I just wanted to provide an answer for anyone who may stumble upon it. That error message:
Sorry, only tenant administrators can add or give access to this app.
is very misleading. You can actually have Global administrator role and still get the error. What worked for me was to actually do tenant scoped changes in ...
you can use ListView Command Set extensions. With SharePoint Framework Extensions you can customize more facets of the SharePoint experience, including notification areas, toolbars, and list data views.
Details can be found in this Microsoft knowledge article. Let me know if this helps.
They're different architecture, provider hosted add-in(app) contains a remote component(a web app usually), if you have add-in part in your provider-hosted add-in, it's render as iframe while spfx webpart is rendered as normal DOM inside a page.
Check official documentation for more details
You may migrate your add-in part to SPFx webpart based on your ...
Adding the reg key net46-strong-crypto-enable.reg with
Windows Registry Editor Version 5.00
and then a reboot fixed it for me