In your Conversation Flow, go the the specific step you need to add the files into. Click "Upload Files" at the right panel.

Option 1:

After clicking "Upload Files", you will see this upload box.

"Drag and drop" the files from your Windows Explorer into the file upload box.

Click "Submit".

Option 2:

From the same "File Upload" box, click "Browse Files". Choose your file source (ie: Desktop, Conversation, Google Drive, etc).

Select the file/s that needs to be added then click "Open".

Click "Submit".

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