Hi @Manuel_Chirino,
Nano Banana isn’t shown in the image module because it’s primarily a Text model which can also output images. Opposed to the “imagen” models which are pure image models.
To fix your Gemini → Gmail issue I think you can simply wrap the data you receive into toBinary({data},base64). You receive the data in base64 but you need binary data for the Gmail module. Similar to here: Image generation is not available in your country - #5 by R-SimplifiedWebhooks
Best,
Richard