I saw a demo using Stackable plug-in "imagebox", and it shows that I can substitude contents by custom fields created by Toolset. But I downloaded the free version of Stackable first, I found that the dynamic fields function is forbbiden. Then, I decided to purchase the premium version and unlock the function. However, I can use only basic fields from WordPress in the Stackable plug-in. It is totally different with the demo showed. I can't see the custom field panel from Toolset in Stackable plug-in, too. I hope I can use all custom fields created by Toolset in Stackable plug-in
Is there any documentation that you are following?
The demo website uses version 2 of the "Image Box" block and you can enable it by checking the option "Load version 2 blocks in the editor", at WP Admin -> Settings -> Stackable.
Once enabled, you'll see two "Image Box" blocks in the blocks list, "Image Box" and "Image Box (v2)" and you can use the latter one to match our demo website.
Note: I'll internally pass this information to the concerned team so that it can be included in our documentation too.