(Multiple) Image upload

Hi all,

believe it or not, but multiple image uploaders are now mostly voided from WP so I was setting up a form for a 10 pictures upload with CF7.

Problem is that after having uploaded more than 2-3 pictures (despite keeping them below the size limit) and for example trying to submit 4+ pictures the form submission went wrong, may this be related to the page refresh time settings overflow?

The code is following:

[file file-90 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-91 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-92 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-93 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-94 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-95 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-96 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-97 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-98 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-99 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]
[file file-100 limit:20000000 filetypes:heic|heif|png|jpg|jpeg|gif|tif|tiff|raw]

[submit "Invia"]

I was also trying this plugin (Images Optimize and Upload CF7) based to work on CF7, as it looks more suitable for the job, but I cannot succeed in uploading it into my page (probably I am pasting the code in the wrong part of the settings):

‘<h3>Drag & Drop Images Here</h3><span>or</span><div class=”images-optimize-upload-button-wrap”>Browse Files</div>’

May someone be so kind to help me out?