when I uploading Image using API the following error message has ocurred Error 500: Internal Server error.

HI ​@Reddy ,

Please click on below button,

& Can you try by using below,

Hope above helps!!

Hi ​@Rakshanda 

I tried your suggestion, but it showed the same error.
 

​@Reddy In addition to Rakshanda comments, you can refer the link below 

I tried this and it working as expected.

https://asiablog.acumatica.com/index.php/2018/01/attach-files-with-rest-api/

HI ​@Reddy ,

Can you please click on button highlighted in yellow color & then make a call

 

Hi ​@Reddy,

Have you checked whether Receipt Number '000001' is available in your system?
I was able to upload the image using the same URL—only the Expense Receipt Number was changed.

e,g. http://localhost/Test24R1/entity/Default/24.200.001/ExpenseReceipt/000021/files/test.jpg