diff --git a/Sources/Moya/MoyaProvider+Internal.swift b/Sources/Moya/MoyaProvider+Internal.swift
index a36232da1..03a4220c5 100644
--- a/Sources/Moya/MoyaProvider+Internal.swift
+++ b/Sources/Moya/MoyaProvider+Internal.swift
@@ -84,11 +84,11 @@ public extension MoyaProvider {
                 return self.sendRequest(target, request: request, callbackQueue: callbackQueue, progress: progress, completion: completion)
             case .uploadFile(let file):
                 return self.sendUploadFile(target, request: request, callbackQueue: callbackQueue, file: file, progress: progress, completion: completion)
-            case .uploadMultipart(let multipartBody), .uploadCompositeMultipart(let multipartBody, _):
-                guard !multipartBody.isEmpty && endpoint.method.supportsMultipart else {
+            case .uploadMultipart(let multipartFormData), .uploadCompositeMultipart(let multipartFormData, _):
+                guard !multipartFormData.parts.isEmpty && endpoint.method.supportsMultipart else {
                     fatalError("\(target) is not a multipart upload target.")
                 }
-                return self.sendUploadMultipart(target, request: request, callbackQueue: callbackQueue, multipartBody: multipartBody, progress: progress, completion: completion)
+                return self.sendUploadMultipart(target, request: request, callbackQueue: callbackQueue, multipartFormData: multipartFormData, progress: progress, completion: completion)
             case .downloadDestination(let destination), .downloadParameters(_, _, let destination):
                 return self.sendDownloadRequest(target, request: request, callbackQueue: callbackQueue, destination: destination, progress: progress, completion: completion)
             }
@@ -172,9 +172,9 @@ private extension MoyaProvider {
         }
     }
 
-    func sendUploadMultipart(_ target: Target, request: URLRequest, callbackQueue: DispatchQueue?, multipartBody: [MultipartFormData], progress: Moya.ProgressBlock? = nil, completion: @escaping Moya.Completion) -> CancellableToken {
-        let formData = RequestMultipartFormData()
-        formData.applyMoyaMultipartFormData(multipartBody)
+    func sendUploadMultipart(_ target: Target, request: URLRequest, callbackQueue: DispatchQueue?, multipartFormData: MultipartFormData, progress: Moya.ProgressBlock? = nil, completion: @escaping Moya.Completion) -> CancellableToken {
+        let formData = RequestMultipartFormData(fileManager: multipartFormData.fileManager, boundary: multipartFormData.boundary)
+        formData.applyMoyaMultipartFormData(multipartFormData)
 
         let interceptor = self.interceptor(target: target)
         let uploadRequest: UploadRequest = session.requestQueue.sync {
diff --git a/Sources/Moya/MultipartFormData.swift b/Sources/Moya/MultipartFormData.swift
index e70d969d0..3fedb211c 100644
--- a/Sources/Moya/MultipartFormData.swift
+++ b/Sources/Moya/MultipartFormData.swift
@@ -3,6 +3,30 @@ import Alamofire
 
 /// Represents "multipart/form-data" for an upload.
 public struct MultipartFormData: Hashable {
+    /// `FileManager` to use for file operations, if needed. `FileManager.default` by default.
+    public let fileManager: FileManager
+
+    /// Separates ``parts`` in the encoded form data. `nil` by default.
+    public let boundary: String?
+
+    /// Blocks of data to send, separated with ``boundary``.
+    public let parts: [MultipartFormBodyPart]
+
+    public init(fileManager: FileManager = .default, boundary: String? = nil, parts: [MultipartFormBodyPart]) {
+        self.fileManager = fileManager
+        self.boundary = boundary
+        self.parts = parts
+    }
+}
+
+extension MultipartFormData: ExpressibleByArrayLiteral {
+    public init(arrayLiteral elements: MultipartFormBodyPart...) {
+        self.init(parts: elements)
+    }
+}
+
+/// Represents the body part of "multipart/form-data" for an upload.
+public struct MultipartFormBodyPart: Hashable {
 
     /// Method to provide the form data.
     public enum FormDataProvider: Hashable {
@@ -34,11 +58,11 @@ public struct MultipartFormData: Hashable {
 
 // MARK: RequestMultipartFormData appending
 internal extension RequestMultipartFormData {
-    func append(data: Data, bodyPart: MultipartFormData) {
+    func append(data: Data, bodyPart: MultipartFormBodyPart) {
         append(data, withName: bodyPart.name, fileName: bodyPart.fileName, mimeType: bodyPart.mimeType)
     }
 
-    func append(fileURL url: URL, bodyPart: MultipartFormData) {
+    func append(fileURL url: URL, bodyPart: MultipartFormBodyPart) {
         if let fileName = bodyPart.fileName, let mimeType = bodyPart.mimeType {
             append(url, withName: bodyPart.name, fileName: fileName, mimeType: mimeType)
         } else {
@@ -46,12 +70,12 @@ internal extension RequestMultipartFormData {
         }
     }
 
-    func append(stream: InputStream, length: UInt64, bodyPart: MultipartFormData) {
+    func append(stream: InputStream, length: UInt64, bodyPart: MultipartFormBodyPart) {
         append(stream, withLength: length, name: bodyPart.name, fileName: bodyPart.fileName ?? "", mimeType: bodyPart.mimeType ?? "")
     }
 
-    func applyMoyaMultipartFormData(_ multipartBody: [Moya.MultipartFormData]) {
-        for bodyPart in multipartBody {
+    func applyMoyaMultipartFormData(_ multipartFormData: Moya.MultipartFormData) {
+        for bodyPart in multipartFormData.parts {
             switch bodyPart.provider {
             case .data(let data):
                 append(data: data, bodyPart: bodyPart)
diff --git a/Sources/Moya/Task.swift b/Sources/Moya/Task.swift
index 191e25933..b7f8cba00 100644
--- a/Sources/Moya/Task.swift
+++ b/Sources/Moya/Task.swift
@@ -28,10 +28,10 @@ public enum Task {
     case uploadFile(URL)
 
     /// A "multipart/form-data" upload task.
-    case uploadMultipart([MultipartFormData])
+    case uploadMultipart(MultipartFormData)
 
     /// A "multipart/form-data" upload task  combined with url parameters.
-    case uploadCompositeMultipart([MultipartFormData], urlParameters: [String: Any])
+    case uploadCompositeMultipart(MultipartFormData, urlParameters: [String: Any])
 
     /// A file download task to a destination.
     case downloadDestination(DownloadDestination)