This server side plugin can get the base64 string and the mime string of any file, as soon as its uploaded. You can then set it to a state of an element and use it in your workflow.
No setup required. Simply install the plugin, and the 'Convert File to Base64' action will be available in your server-side workflows.

Convert File to Mime & Base64

This server-side action takes a file input and returns its raw Base64 encoded data string and its detected MIME type.

Inputs:
File: The file you wish to convert. This should be sourced from a file uploader element or a file stored in your Bubble database.

Outputs:
Base64 Data: (Type: text) - The resulting Base64 encoded string of the file's content.
MIME Type: (Type: text) - The detected MIME type of the file (e.g., 'image/png', 'application/pdf'). Returns 'application/octet-stream' if the type cannot be determined reliably.

**Use Case Example:**
You can use this action in a server-side workflow triggered after a user uploads a file. The resulting Base64 data and MIME type can then be saved to your database or used in subsequent API calls that require file data in this format.