Guide

1. Inside the Source tab, click the 'More Options' button at the top-right corner.

2. Select 'Add File' from the list of options.

3. After that, come up with a unique filename and enter it into the provided input field.

4. Click the text box afterwards, then type the series of codes you wish to upload.

5. Next, configure the text format settings based on your preferences.

6. Once done, tap 'Commit'.

7. Provide a short commit message and then tap 'Commit' to proceed.

8. After completing these steps, the codes will be uploaded to your Bitbucket repository.