成员的完整列表，这些成员属于 com.netease.nimlib.sdk.v2.storage.V2NIMStorageService,包括所有继承而来的类成员

addCustomStorageScene(String sceneName, long expireTime)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
cancelUploadFile(V2NIMUploadFileTask fileTask, V2NIMSuccessCallback< Void > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
createUploadFileTask(V2NIMUploadFileParams fileParams)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
downloadAttachment(V2NIMDownloadMessageAttachmentParams downloadParam, V2NIMSuccessCallback< String > success, V2NIMFailureCallback failure, V2NIMProgressCallback progress)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
downloadFile(String url, String filePath, V2NIMSuccessCallback< String > success, V2NIMFailureCallback failure, V2NIMProgressCallback progress)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
getImageThumbUrl(V2NIMMessageAttachment attachment, V2NIMSize thumbSize, V2NIMSuccessCallback< V2NIMGetMediaResourceInfoResult > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
getStorageSceneList()	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
getVideoCoverUrl(V2NIMMessageAttachment attachment, V2NIMSize thumbSize, V2NIMSuccessCallback< V2NIMGetMediaResourceInfoResult > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
shortUrlToLong(String url, V2NIMSuccessCallback< String > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService
uploadFile(V2NIMUploadFileTask fileTask, V2NIMSuccessCallback< String > success, V2NIMFailureCallback failure, V2NIMProgressCallback progress)	com.netease.nimlib.sdk.v2.storage.V2NIMStorageService