How to create Files in Salesforce using REST API?

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How to create Files in Salesforce using REST API?

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1. Create a Connected App in Salesforce.

Callback URL should be https://{Your Salesforce Domain}.my.salesforce.com/services/oauth2/callback.

My Org Callback URL is https://test-ec-dev-ed.develop.my.salesforce.com/services/oauth2/callback.

2. Do a POST Request to https://{Your Salesforce Domain}.my.salesforce.com/services/oauth2/token to get the access token.

My Org Token Endpoint URL is 

https://test-ec-dev-ed.develop.my.salesforce.com/services/oauth2/token

3. Do a POST Request to https://{Your Salesforce Domain}.my.salesforce.com/services/data/v55.0/sobjects/ContentVersion/ to create ContentVersion record.

My Org ContentVersion endpoint URL is 

https://test-ec-dev-ed.develop.my.salesforce.com/services/data/v55.0/sobjects/ContentVersion/

Sample POST body:

{
  "Title" : "Test",
  "PathOnClient" : "test.txt",
  "ContentLocation": "S",
  "VersionData": "VGVzdGluZw=="
}

Here “VGVzdGluZw==” set in VersionData is nothing but Base64 Encoded value for “Testing”.

4. Do a GET request to https://{Your Salesforce Domain}.my.salesforce.com/services/data/v53.0/query/ to get the ContentDocumentId.

My Org Query endpoint URL is

https://test-ec-dev-ed.develop.my.salesforce.com/services/data/v53.0/query/

Query Params:

q = SELECT+ContentDocumentId+FROM+ContentVersion+WHERE+Id=’0683t00000LqUIbAAN’

5. Do a POST Request to https://{Your Salesforce Domain}.my.salesforce.com/services/data/v55.0/sobjects/ContentDocumentLink/.

My Org ContentDocumentLink Endpoint URL is

https://test-ec-dev-ed.develop.my.salesforce.com/services/data/v55.0/sobjects/ContentDocumentLink/

Sample Body:

{
  "ContentDocumentId" : "0693t00000L22SHAAZ",
  "LinkedEntityId" : "0013t00002XXRyDAAX",
  "Visibility": "AllUsers"
}

Output:

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