o add file upload to bbPress, you can install a WordPress plugin like:
Image Upload for bbPress
This plugin allows users to:
Upload images with a drag-and-drop interface
Insert multiple images at once
Generate thumbnails for uploaded images
Limit the number of images that can be uploaded per topic or reply
Automatically resize images to fit specified dimensions
GD bbPress Attachments
This plugin allows users to:
Upload files to topics and replies in bbPress
Limit the number of files that can be uploaded at once
Embed a list of attached files into topics and replies
Control file sizes from the main plugin settings panel
Control which visitors can see a list of attachments
To install a plugin in WordPress, you can:
Log in to your WordPress Admin
Select “Plugins” > “Add New” in the left sidebar menu
Click “Upload Plugin” at the top of the page
Select the plugin ZIP file and click “Install Now”
Click “Activate Plugin”