Hi, @SSharma043 
Were you able to get this one sorted out? If not, I’ll share a quick example using Postman.
Summary:
- Upload the file
- Create the Note
- Associate the File to the Note
- Associate the Note to the Object
Steps
- Upload your file via API and note the value for “id”
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Files added can be associated to an Object as a Note
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Use the 'id” vale as the value for “hs_attachment_ids” when creating a note
POST https://api.hubapi.com/crm/v3/objects/notes
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Then you can make a call to associate the Note to a Deal
PUT https://api.hubspot.com/crm/v3/objects/notes/{note_ID}/associations/deal/{deal_ID}/214
I hope this helps you or the next person who is looking to upload and associate files to objects in this manner.
Best,
Jaycee