The uploaded file does not seem to be a Postman collection.
A Postman collection begins with JSON such as this:
{
"info": {
"_postman_id": "603ab42c-9bb6-4b1d-b9f4-9df603a77e26",
"name": "Name of API",
"description": "Description of API.",
"schema": "https://schema.getpostman.com/json/collection/v2.0.0/collection.json"
},
"item": [
{
"name": "statements",
...