Shopify custom app development issue

Shopify Apps
1

Hey everyone!
I’m currently learning Shopify custom app development and following the official Shopify documentation step-by-step for scaffolding an app:
My app is successfully created and installed on the Shopify admin, but I’m facing an issue:
:backhand_index_pointing_right: The app installs fine
:backhand_index_pointing_right: But no UI components are showing
:backhand_index_pointing_right: Instead, it only shows a “response handling” and " enhance-reporters-fibre-gene.trycloudflare.com’s server IP address could not be found." type output

I’ve spent quite a few days trying to debug this. I’ve also used ChatGPT to go through different possible causes (routing, embedded app setup, React file structure, Polaris/App Bridge issues, etc.), but I still haven’t been able to figure out what I’m missing.
At this point, I’m reaching out to the community.
If anyone has experience with Shopify custom app development (especially with Remix / React Router setups), I’d really appreciate your guidance on:

  1. Why an app would install successfully but not render UI in admin
  2. Common misconfigurations that cause blank/response-only screens
  3. Anything specific in newer Shopify app structure that I might be missing

Even a small hint or direction would help a lot.
Thanks in advance to anyone who takes the time to help :raising_hands:

2

Hey @jason-bosidan1122
1.Restart the dev server
Stop and run shopify app dev again.

2.Get a new tunnel URL
When you run it again, a new link will be generated like:

https://xxxxx.trycloudflare.com

3.Update Shopify Partner Dashboard
Remove the old App URL and paste the new tunnel URL

4.Reopen the app
Reload Shopify admin. The app UI should load properly.

I hope this helps.
Thank You!