WEB interface for downloading files based on Google tables

Scenario of work:
The interface receives xlsx files and csv files.
If the file is successfully downloaded, the information message about the successful completion of the script will be displayed / if failure, the error code will be displayed.
The file is converted from csv or xlsx to Google tables format and is stored on the Google disk.
Each stored file contains transaction information and after the file is uploaded to the Google disk, all information will be uploaded to the archive file to which only those transactions that are not yet there will be added.