gistfile1.txt

func resumableUpload(videoURL: URL, sessionId: String, fileSize: Int64) async throws {
    var offset = max(
        startResponse.nextOffset,
        await offsetStore.offset(for: sessionId)
    )

    while offset < fileSize {
        do {
            let chunkFile = try temporaryChunkFile(
                sourceVideoURL: videoURL, offset: offset, length: Int(chunkSize)
            )
            let request = makeChunkRequest(
                sessionId: sessionId, offset: offset, totalBytes: fileSize
            )

            _ = try await session.data(for: request)
            offset += chunkFile.byteCount
            await offsetStore.set(offset: offset, for: sessionId)
        } catch {
            offset = try await fetchRemoteOffset(sessionId: sessionId)
            await offsetStore.set(offset: offset, for: sessionId)
        }
    }
}