Creating Image Ad

Hello Google Ads API team,

I have a question related to Image Ads.

I am creating an image ad using Google API.  I am using the reference id that is a read only provided by Google as the media Id. 

But when I try to create an image ad I am getting "RangeError.TOO_LOW" error on media id when media id < 0.

1. Is it wrong to use reference id as media id ?

2. Should I still abs value of reference id as media id ?

3. Can I generate a random number and use that as the media id  or is there a another way ? 

Could you please help me with this question

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