Image or audio field type - how to create a hidden caption field using relevant condition?

[StephenChignell1]

Hi there,

I'm using Survey123 and have an image field and audio field in my survey. I text fields after each one for people to enter a caption/description of the attachment. I would like these to be hidden and only appear if the user uploads a file. 

I have tried to use the relevant settings to do this, but none of the formals that I've found on the forums (e.g. Can relevant field be dependent on if condition IS NOT NULL)  seem to work with attachment fields.

Thanks for your time,

Steve

[SMauri]

Hi Stephen,

try this string in relevant column: once(${image_question})> ''

Cheers

Stefano