How can I send a value from a custom field of the current post with the bit form?
The post has a custom field “jobID”. I have to send this ID with the form, but I can’t get it anywhere in the form, for example, in a hidden field.
I expected the smart tag ${_bf_user_meta_key(job_id)} would work. I also tried ${_bf_post_meta_key(job_id)} , but it seems this tag isn’t so smart after all.
Okay, in my desperation, I tried using a Bricksbuilder dynamic tag {acf_job_id} in the BitForm field, and lo and behold, it works! Does this speak for BitForm or for Bricksbuilder now? 
If this is actually an intended feature, it should be mentioned in the documentation
I’m glad to see that you were able to resolve the issue by fetching the custom field data through our smart tag while using Bricks Builder.
Our smart tag is designed to fetch only the default WordPress meta-keys. It doesn’t pull meta-keys from ACF or other plugins. However, when you used Bricks Builder, it combined all the meta-keys together, allowing our smart tag to successfully detect and fetch the custom field data.
Since this isn’t part of our default process, it hasn’t been included in our documentation.