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copied!<p>I'm going to answer this myself just in case anyone else has the same issue. </p> <p>It turns out that I was making this way more difficult than it needed to be. The Dropbox SDK handles chunking the files so I just needed to initate the transfer and react to the delegate calls. The methods used are:</p> <p>To send a file chunk - for the first chunk, use nil for the uploadId and 0 for the offset:</p> <pre><code>- (void)uploadFileChunk:(NSString *)uploadId offset:(unsigned long long)offset fromPath:(NSString *)localPath; </code></pre> <p>After sending the last chunk, use this method to commit the upload:</p> <pre><code>- (void)uploadFile:(NSString *)filename toPath:(NSString *)parentFolder withParentRev:(NSString *)parentRev fromUploadId:(NSString *)uploadId; </code></pre> <p>I handled the delegate method as follows:</p> <pre><code> - (void)restClient:(DBRestClient *)client uploadedFileChunk:(NSString *)uploadId newOffset:(unsigned long long)offset fromFile:(NSString *)localPath expires:(NSDate *)expiresDate { unsigned long long fileSize = [[[NSFileManager defaultManager]attributesOfItemAtPath:[FileHelper localDatabaseFilePath] error:nil]fileSize]; if (offset >= fileSize) { //Upload complete, commit the file. [self.restClient uploadFile:DATABASE_FILENAME toPath:[FileHelper remoteDatabaseDirectory] withParentRev:self.databaseRemoteRevision fromUploadId:uploadId]; } else { //Send the next chunk and update the progress HUD. self.progressHUD.progress = (float)((float)offset / (float)fileSize); [self.restClient uploadFileChunk:uploadId offset:offset fromPath:[FileHelper localDatabaseFilePath]]; } } </code></pre> <p>Since the main problem that I was trying to address was handling poor connections I implemented delegate method for failed chunk uploads:</p> <pre><code>- (void)restClient:(DBRestClient *)client uploadFileChunkFailedWithError:(NSError *)error { if (error != nil && (self.uploadErrorCount < DROPBOX_MAX_UPLOAD_FAILURES)) { self.uploadErrorCount++; NSString* uploadId = [error.userInfo objectForKey:@"upload_id"]; unsigned long long offset = [[error.userInfo objectForKey:@"offset"]unsignedLongLongValue]; [self.restClient uploadFileChunk:uploadId offset:offset fromPath:[FileHelper localDatabaseFilePath]]; } else { //show an error message and cancel the process } } </code></pre>

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