How can I load the base64 image from database?

The error says the file object must have the schema

{
 "name": 'file name string',
 "type": 'image/*',
 "sizeBytes": number,
 "base64Data": 'base64 string goes here'
}

Your object looks to be an array with differently named key/value pairs. Have you tried to convert to an object and renaming the keys as per the schema requested?