Unable to test an API in JMeter where I need to upload a file - api

Question

can someone please help me with uploading a file on JMeter I feel its very tricky thing...
let me share the screen shot of what I've done
enter image description here
Its failing with below error:
Thread Name:jp#gc - Ultimate Thread Group 2-4
Sample Start:2021-02-04 17:28:44 IST
Load time:562
Connect Time:0
Latency:562
Size in bytes:595
Sent bytes:84568
Headers size in bytes:446
Body size in bytes:149
Sample Count:1
Error Count:1
Data type ("text"|"bin"|""):text
Response code:500
Response message:
HTTPSampleResult fields:
ContentType: application/json
DataEncoding: null
Response Body:
{"timestamp":"2021-02-04T11:58:45.482+00:00","status":500,"error":"Internal Server Error","message":"","path":"/pps/storage/upload-image"}
Request Body:
POST https://pixelperfectdevexternal.useready.com/pps/storage/upload-image
POST data:
--axOhwnTOrVj2VWGGuxcaqfjgHwGQKsTFl
Content-Disposition: form-data; name="filename"
Content-Type: image/jpeg; charset=US-ASCII
Content-Transfer-Encoding: 8bit
${filename}
--axOhwnTOrVj2VWGGuxcaqfjgHwGQKsTFl
Content-Disposition: form-data; name="filename"; filename="Passport size photo.jpeg"
Content-Type: image/jpeg
Content-Transfer-Encoding: binary
<actual file content, not shown here>
--axOhwnTOrVj2VWGGuxcaqfjgHwGQKsTFl--
I'm totally stuck on this from last 3 weeks, I did what was told in tutorials and still its not working, someone please help me out.

Answer 1

We don't know how to fix the issue because we don't know how the request should look like, moreover you don't show us "Parameters" tab of the HTTP Request sampler and HTTP Header Manager configuration.
So if you have another way of successfully calling this API like curl or Postman or other tool - you should be able to record the request using JMeter's HTTP(S) Test Script Recorder, see How to Convert Your Postman API Tests to JMeter for Scaling article for example setup.
If not, you need to check your API endpoint documentation, application logs or ask around for the proper request format, once you know it you should be able to amend the request yourself or provide us more details so we could assist.