Hi @erpnxt_user,
If you create a custom app in the local system then go to the app directory (frappe-bench/app/custom_app).
if have a GitHub account then first create a repository in github.
Then run the command:
git add .
git commit -m "first commit"
git branch -M main
git remote add origin https://github.com/github_username/your_repository_name.git
git push -u origin main
Then check your repository branch.
All custom app data set in repo branch.
and Install custom app in Frappe cloud for:
https://frappecloud.com/docs/bench/install-custom-app
Thank You!