Uploading file to custom field of type file_upload using zoho crm api v2 (Account) - maximum_length error

Uploading file to custom field of type file_upload using zoho crm api v2 (Account) - maximum_length error

Hi,

So i tried the steps from:
https://help.zoho.com/portal/en/community/topic/want-to-upload-images-to-custom-image-fields-using-zoho-crm-api-v2?src=zcomforumjul19

Step 1.
Currently I am uploading a file with (POST) https://www.zohoapis.com/crm/v2/files to zoho and get the following Response.

  2. {
  3.   "data": [
  4.     {
  5.       "code": "SUCCESS",
  6.       "details": {
  7.         "name": "logo.png",
  8.         "id": "6bf2752ab70ab22b3341856dcc04107ab137224f724904c1234567890123456789"
  9.       },
  10.       "message": "logo.png uploaded Succeessfully",
  11.       "status": "success"
  12.     }
  13.   ]
  14. }

Step 2
After that i am trying to add the file to the custom field "Company_Logo" (type=file_upload) with (PUT) https://www.zohoapis.com/crm/v2/Accounts/1234567890123456 and the following JSON data

  2. {
  3.   "data": [
  4.     {
  5.       "Company_Logo": [
  6.         "6bf2752ab70ab22b3341856dcc04107ab137224f724904c1234567890123456789"
  7.       ]
  8.     }
  9.   ]
  10. }
Which results in the following Error

  2. {
  3.   "data": [
  4.     {
  5.       "code": "INVALID_DATA",
  6.       "details": {
  7.         "maximum_length": 1,
  8.         "api_name": "Company_Logo"
  9.       },
  10.       "message": "invalid data",
  11.       "status": "error"
  12.     }
  13.   ]
  14. }
When I change the Field Properties to allow multiple files (Upload multiple files - Maximum 5 files), the same error occures with "maximum_length": 5.

I also changed the JSON Data to 
  1. {
  2.   "data": [
  3.     {
  4.       "Company_Logo": "1"
  5.     }
  6.   ]
  7. }
which results in status = 'success' but nothing changed to the data inside the custom field.