...
- Tap the Collect Data button and choose an instrument and a record. Enter data and set the form status at the bottom as needed.
- Records can be renamed on the first form. Note that renamed records will appear as new records when uploaded to the main database, so you will need to delete the original record there to complete the replacement process.
- Instruments can be secured so that participants/users will only have the option of entering data (and not traversing the rest of the app, which can jeopardize confidentiality). They can be unlocked via the primary user's pin.
- All data collection can be offline – without Internet access.
...
When back ONLINE, you can send data to the project’s REDCap server.
New Records
- They will be added to the main REDCap project immediately if no conflicts exist.
- If auto-numbering is enabled and there is a record name conflict, REDCap will automatically update the record numbers to the next numerical series of numbers before uploading and provide details on the app page.
Existing Records 
- An option to send the data to the server for each modified record appears, as well as the opportunity to view details of the differences between server data and app data for that record.
- If a record is deleted from the app, it will not be deleted from the server after data syncing. You may only delete records from the main project on the server.
...
Two options after data is sent
There are two options after data files are sent to server successfully.
It is recommended to click “Clean & Reset Mobile Project” “Refresh Setup & Data” to remove old mobile data and replace with the most current project information from the main REDCap project.
...