Bulk uplad, Failing after two successful uploads every time

Increase your php memory limit by modifying php.ini

This bulk upload designed specifically for small but many images at a time.

Increased memory limit from 256M to 512M,
then increased to 1024 Maximum

Still same problem

20 Images of approx 30KB all upload with no problem

2 Images of approx 0.9MB (900KB) fail to upload

Twice I have got this error: Invalid JSON response from server

Additional Info from php.ini below:

; Maximum amount of memory a script may consume (128MB)
; https://php.net/memory-limit
memory_limit = 1024M

Path to your Web document root: /home/users/web/b2/ipg.3streamscouk
This is important, as most of your scripts will need to specify this location. For example, this is required if you’d like your PHP script to upload files.

Current Default version of PHP: 7.0

; Temporary directory for HTTP uploaded files (will use system default if not
; specified).
; https://php.net/upload-tmp-dir
;upload_tmp_dir =

; Maximum size of POST data that PHP will accept.
; https://php.net/post-max-size
post_max_size = 20M

; File Uploads ;
;;;;;;;;;;;;;;;;

; Whether to allow HTTP file uploads.
; https://php.net/file-uploads
file_uploads = On

; Temporary directory for HTTP uploaded files (will use system default if not
; specified).
; https://php.net/upload-tmp-dir
;upload_tmp_dir =

; Maximum allowed size for uploaded files.
; https://php.net/upload-max-filesize
upload_max_filesize = 20M

; Maximum number of files that can be uploaded via a single request
max_file_uploads = 20

edit file
\wp-content\plugins\wp-upg\layout\form\bulk\dropzone.js

At line 177
parallelUploads: 2,

try change to
parallelUploads: 10,

=========

If it doesn’t solve try to look some other values and update accordingly.
Let me know the changes if it works so that It will will other users too.