If the reocrd is not share with user then when queried using filter on custom field it doesn't return record. But when queried using Id filter or contentdocumentId filter then it return the record.
I have a custom external Id field Unique_Key_String__c' which I'm using in query
Below query doesn't work
Select id,Unique_Key_String__c,Origin,PublishStatus,SharingOption,SharingPrivacy from contentversion where Unique_Key_String__c= '0683C000000K9Mr;cv'
Below query works
Select id,Unique_Key_String__c,Origin,PublishStatus,SharingOption,SharingPrivacy from contentversion where id = '0683C000000K9Mr'

this happens only when record is not shared with current user

Header Content-Type: multipart/form-data; boundary=boundary_string

Content-Disposition: form-data; name="entity_Attachment";
Content-Type: application/json

{  
    "Description" : "Marketing Q1 2011",
    "ParentId" : "00Q1700000BLt9F",
    "Name" : "Marketing Brochure Q1"
}

--boundary_string
Content-Type: application/pdf
Content-Disposition: form-data; name="Body"; filename="2011Q1MktgBrochure.pdf"

Zm9yIHRoZSByZX..........DQoNCg0KDQoNCg0KDQo

--boundary_string--

I've also tried adding Content-Transfer-Encoding: base64 just below Content-Type: application/pdf ​​​​​​, but that also isn't working.

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