How to add multiple media files in a single question (using media::image, media::audio columns)

Do you mean a default answer to a question? You can use default to set static or dynamic prefilled answers for the form this way

I upload my XLSX forms to ODK Central, which validates and converts to XML, I don't know what your configuration is, but there are online and offline methods to convert to XML XForms, (another)

is this ODK service Central, paid or free?

I was researching this question, in which a multiple choice question displays an image for each question,However, there was an error and only the image appears on my form. When I remove the image, the form works perfectly with the writing. Can anyone tell me what could be wrong?
This is what the finished form looks like:

The only thing I did was attach the photo to ODKCENTRAL, and in the choices tab, I put filename.jpg With an "image" column, It is not in the attachment however the only thing that appears in this form is the image that I attached, when I remove the image from the form the form appears normally as I explained above


In the example of my form I only attached an image as a test but all the questions that have blue fills will have images or videos attached, I would like to know if for video it is also possible to attach a small video to each multiple choice question