How to make a query with optional file Upload?

[Mukhametvaleev]

My schema:

scalar Upload

input CompanyUpdateInput {
    logo: Upload  # logo is optional
}

type Company {
    id: ID!
}

type Mutation {
    updateUserCompany(company: CompanyUpdateInput!): Company!
}

Case 1: Make a query with no File selected:

• AR: Extension unknown error in response: "file with index not found: 0"
• ER: Gateway proxy empty File or null to subgraph.

Case 2: Make a query with no File/map keys in form-data:

• AR: Extension unknown error in response: "error parsing file map unexpected end of JSON input"
• ER: Gateway proxy request to subgraph with no logo field.