Issue in getting content of PDF/Doc etc

First, can you confirm that the "/test/BackcardHTTPS.pdf" file on Dropbox itself is not empty and does contain the expected data?

Then, can you inspect the API response? Check the status code; if it's not 200, then the call failed for some reason. You should also check the response headers for metadata, and response body for the file data, if the call succeeded. If it failed, there should be some error.

By the way, you shouldn't post your access token like that. You should redact it from your image, and then revoke and replace it.

I have checked  "BackcardHTTPS.pdf" contain proper data.

And Api response is code is 200.

When I am trying to read text file(*.txt) every thing is working fine.

What about the rest of the response? What's in the headers and body?

Request Endpoint:

 https://content.dropboxapi.com/2/files/download

Request header: 

 Authorization  : Bearer <REDACTED>

 Dropbox-API-Arg : {"path":"/test/BankcardHTTPS.pdf"}

Please suggest why i am getting Blank PDF file. 

I am Sharing Sample Project code .

Request you to please have a look and suggest what wrong happening there.

Sample Code:

procedure TForm6.FormCreate(Sender: TObject);
var
url:string;
lParams: TStream;
FStream: TStream;
SaveDir,TempFile:AnsiString;
MyText: TStringlist;
req:string;
response:AnsiString;
Base64: string;

Input: TStringStream;
Output: TFileStream;

begin
try
FStream := TStringStream.Create;
MyText:= TStringlist.create();
try

IdHTTP1.Request.CustomHeaders.Values['Dropbox-API-Arg'] :='{"path":"/test/BankcardHTTPS.pdf"}';
IdHTTP1.Request.CustomHeaders.Values['Authorization'] := 'Bearer <REDACTED>';
response:=IdHTTP1.Post('https://content.dropboxapi.com/2/files/download',FStream);

MyText.Add(response);
MyText.SaveToFile('.\BankcardHTTPS.pdf');

except
on E: Exception do
begin
ShowMessage('Error: ' + E.Message);
end;
end;
finally
lParams.Free;
MyText.Free;
end;
end;

Any Update.

This shows your request headers and code, but not the response headers or body. Can you inspect the response headers/body?

Also, do not post your access token, since it enables access to your account. You should revoke it since you've posted it publicly.

Sorry i missed to share response in last chat.

I have saved response in txt fine and sharing screenshot with you.

Thank you for your response.