You need edit access to the destination team or folder to create an App, and Can edit access to change an existing one.
Create an App
Choose a destination
Open Content from your profile menu, choose the team and folder, then select New → App.
Describe the outcome
Enter what the App should do, check the suggested name, and choose Create app. For example:
Build a supplier order dashboard with filters for supplier and expected delivery date. Show overdue orders and let me open the related NetSuite record.
Your brief is prepared in the editing conversation. Review it and send it when ready. Build and review
Work with Erstan in the editing chat. Explain the intended users, required data, and which actions need approval. Review the preview and the Data section as the App takes shape. Publish when ready
Test the screens, inputs, and permissions, then choose Publish. Saving a draft and publishing it are separate actions. See Publish and share. Edit an existing App
Open the App and choose App actions → Edit App. The editor has three sections:
Use the editing chat to request changes in plain language. The ordinary Open chat conversation helps you use the App; choose Edit App for changes to its design, code, or data configuration.
Preview changes
Draft changes are visible to authorized editors and do not replace the published App. Use the draft preview to check the layout, navigation, and reads before release. Draft previews can read real data with your access, but cannot perform production writes through the App bridge.
An Unpublished changes indicator means the working draft differs from the published version. A data refresh alone is not a code change.
Ask for a small change, review its preview, then continue. For example: “Add an overdue-only filter and keep the existing columns.”
Pages, files, and history
Use Settings to configure available page and presentation options. Native Sheet and Database pages keep the permissions of their original resources. Page configuration changes belong to the draft until published.
App actions → Revisions lets editors inspect the draft, published version, and earlier revisions. Open folder takes you to the source files in Content. Use Restore revision only after reviewing the version you intend to make active.
If something fails
Check App activity for the failed read or action. For a save error, use Retry save and confirm it succeeds before publishing. If a connection is missing, reconnect it and retry the read. If data access is denied, check both App access and access to the underlying resource with its owner. 
