1. First, determine the capacity of the U disk. Bidding documents include documents, photos, videos and other file types. Therefore, it is necessary to determine the size of the tender and choose a USB flash drive with a capacity of 2GB to 8GB.
2. Then select the transmission speed. When transmitting a large number of documents, the transmission speed of U disk must be considered, because the data transmission speed is faster, which can speed up the transmission speed of bidding documents.
3. Then determine whether the U disk is reliable, and choose a good quality, waterproof and shockproof U disk.
4. Finally, stamp. If there are electronic seals and electronic signatures, they can be stamped directly. If not, you can print it out, stamp it and scan it into a pdf or word file.