# Thumbnail administration (IRPCThumbnailsAdmin)

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Administration API](https://developer.m-files.com/APIs/gRPC-API/admin/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/

Discards the thumbnail images stored in a vault.

Provides methods for administering thumbnails.

- **gRPC service:** `MFiles.IRPCThumbnailsAdmin`
- **Book and level:** [Administration API](https://developer.m-files.com/APIs/gRPC-API/admin/index.md), specialized
- **Methods:** 1
- **Proto file:** [`mfiles/IRPCThumbnailsAdmin.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/IRPCThumbnailsAdmin.proto)

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## Overview

The service has one method,
[ResetThumbnailImages](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages/index.md), behind the Reset
Thumbnail Images command of a vault in M-Files Admin. It needs a vault session with the vault
rights `change_metadata_structure` and `license_allows_modifications`
([VaultAccess](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.VaultAccess/index.md)).

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## Methods

| Method | Summary | Facts |
|---|---|---|
| [ResetThumbnailImages](https://developer.m-files.com/APIs/gRPC-API/Reference/MFiles.IRPCThumbnailsAdmin/ResetThumbnailImages/index.md) | Discards all thumbnail images stored in the vault. | `admin` `session` `idempotent` |