The files that i've uploaded were replaced

Prerequisites

[x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
[x] The issue still exists against the latest master branch of bootstrap-fileinput.
[x] This is not an usage question. I confirm having read the plugin documentation and demos.
[x] This is not a general programming / coding question. (Those should be directed to the webtips Q & A forum).
[x] I have attempted to find the simplest possible steps to reproduce the issue.
[x] I have included a failing test as a pull request (Optional).

Steps to reproduce the issue

I've download the newest package and I've import the js and css but i got problem that the package replace the files that i've input not extend the exist files. Another problem is I can't remove the single file, it just can remove the entire files

Expected behavior and actual behavior

When I follow those steps, I see files replaced I was expecting that the files not replaced and can remove a single file.

Here is it the code <input id="files" name="files[]" class="file" type="file" data-theme="fas" accept="image/jpeg,image/jpg,image/png,application/pdf" required multiple>

And this is the js

$("#files").fileinput({
                previewFileType: 'any',
                showRemove: true,
                showUpload : false,
                maxFileSize: 5000,
                allowedFileExtensions: ["png", "jpg", "jpeg", "pdf"],
                showClose: false,
                language: 'id',
});

Environment

Browsers

[x] Google Chrome
[ ] Mozilla Firefox
[ ] Internet Explorer
[ ] Safari

Operating System

[x] Windows
[ ] Mac OS X
[ ] Linux
[ ] Mobile

Libraries

jQuery version: jQuery v3.4.1
bootstrap-fileinput version: bootstrap-fileinput v5.2.2

Isolating the problem

[x] The bug happens consistently across all tested browsers
[x] This bug happens when using bootstrap-fileinput without other plugins

kartik-v / bootstrap-fileinput