Forms: File Upload Field is missing

[#1]

Hello,
i'm currently learning how to setup simple Process Automations.
So basically, my first goal is to create a simple Process containing a PDF-File upload Form + Approval.

I'm stuck at multiple Problems:

1. In Forms the "File upload" field is Missing
2. How to setup Document Management Service & Destination correctly ?
   
3. How to use my Destination & Document Management with my Forms ?

I'm using a Free Tier Account.

I have this Service enabled with the Free plan:
- Document Management Service, Integration Option
- SAP Process Automation
- SAP Business Application Studio
- Launchpad Service

I didn't enabled this service, because there is no Free plan:
Document Management Service, Application Option

I have a existing Process that i created one month ago with a Form that has a "File upload" -Field.
But i cannot get it to work, because i don't know how to set up the Document Management Service & Destination correctly and connect the Process/Form with that Destination...

When i create a Form there is no "File upload" Field.

Last month i followed a guide i found online, back then i was able to create a Form with a File upload field.

I don't know why, but now i'm not able to use the Field "File Upload".
When i delete the existing File Upload Field its gone, and i'm not able to add a new one.

I followed a guide that was half in Chinese that showed how to create a Document Management Respository by using a POST Request with Postman. And i tried to create a destination. But i don't know if its correct or even working. As i said before, i Created a Form one Month ago, and i was able to use the File Upload field. But this form doesn't work because there is something wrong with the Document Management. I get an Error message saying there is a problem with the connection to the Document Management.

[Archana]

File upload option is only shown if you have configured the DMS destination. Check the documentation here

[FreddyG]

I don't know what i'm missing, and where can i even configure it?
In my Post i wrote all the steps i did. I'm kinda lost here

I just want to learn about Process Automation and create a Simple File Upload form + Approval Process.
The confusing part is, some weeks ago i was able to use Upload-Fields in Forms.

I could need a step by step guide, starting with a fresh subaccount (Free Tier)
- What services/subscriptions do i need (Free Plan) ?
- How to create a working Destination to the DMS ?
- How to connect the Destination or DMS to the Process Automation ?