Create a React Component that acts as a dropzone for the user to upload files.

 The user should be able to click to upload files or drag and drop files onto the component

 Once the user selects some files, the component should switch to show them an input for

Custodian and a submit button.

 When the user clicks submit, the component should show a progress bar indicating the

status of the files uploading. Actually uploading the files to a server is not required, but the

component should ‘Mock’ the time it takes for each file to upload so that the progress bar

shows progress.

 While files are uploading, the user should be able to drop in another set of files and enter

another Custodian name, allowing for multiple ‘batches’ of simultaneous uploads.