In the Survey Editor module, click on "Survey Settings" .
In "General" , check the box "Insert Image (logo)” and click on “edit”.
You can upload your images and or delete previously uploaded images.
Select your favourite and click ‘insert”.
Don’t forget to validate your options !
Note : Images with the extensions .gif, .jpeg, .jpg, .png are accepted.
You can resized images in some contexts to properly fit the space provided,
To do this :
Use .png files because they are more responsive to resizing process.
Although, all accepted file extensions may work,
If you encounter problems try to upload the file as a .png or upload larger images with more pixels.