Files Uploaded are Corrupted After api usage

It sounds like there may be a problem with how you're transmitting or encoding the data for the upload call. Can you share the problematic code?

$dropbox_url_upload = "https://content.dropboxapi.com/2/files/upload";
	$opendoc = fopen($filename, 'rb');
	$docsize = $doc['size'];
	$d1curl = curl_init();
	curl_setopt($d1curl, CURLOPT_URL, $dropbox_url_upload);
	curl_setopt($d1curl, CURLOPT_TIMEOUT, $timeout);
	curl_setopt($d1curl, CURLOPT_HTTPHEADER, [
		utf8_encode('Authorization: Bearer ' . $dropbox_token),
            'Content-Type: application/octet-stream',
            'Dropbox-API-Arg: '.
            json_encode(
                array(
                    "path"=> $dropbox_directory,
                    "mode" => "add",
                    "autorename" => true,
                    "mute" => false
	))]);
	curl_setopt($d1curl, CURLOPT_POST, true);
	curl_setopt($d1curl, CURLOPT_POSTFIELDS, base64_encode(fread($opendoc, $docsize)));
	curl_setopt($d1curl, CURLOPT_RETURNTRANSFER, true);
	$dropbox_upload = curl_exec($d1curl);
	$http_request = curl_getinfo($d1curl, CURLINFO_HTTP_CODE);
	echo $dropbox_upload;
	echo $http_request;
	curl_close($d1curl);
	fclose($opendoc);

It is working now and am able to view the contents on my dropbox viewer. However, when I tried doing it without any encoding yesterday, I also had corruption. What could increase the risk of file corruption when uploading with the api?

There's no reason an upload without extra encoding like that should result in a corrupted file.

If you can reproduce an issue where correct code and a valid original file results in a corrupted file when uploaded to Dropbox via the API, please share the steps and code to reproduce it so we can look into it.