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Database recovery (file import)

I am trying to restore phpMyAdomin's database.
I tried to import a file (ex. ○○○ .sql) and

Please be patient, the file is being upload.Details about the upload are not available.

is displayed and after a few seconds you jump to the login screen (url is https: //XXX/import.php).
Even after logging in again, the import is not successful.
There are no other error messages.

The file I want to import is from 2016 (2 years ago). Has the specification changed?

* I would appreciate it if I could solve it as easily as possible because I usually have enough knowledge to blog with wordpress. (I'm happy if it can be solved even if difficult)

Error message
Please be patient, the file is being upload.Details about the upload are not available.
Applicable source code Tried Supplemental information (FW/tool version etc.)

File character set: utf8
Partial import: (check) Number of records: 0
File format to import: SQL
Option SQL compatibility mode: NONE