You can use the Picard tool to create an index file *.bai for the BAM file, and then use the visualization software (IGV)

Extracted long fragment gDNA samples can be stored at 4°C for half a year and at -20°C for one year. However, it is recommended to freeze and thaw only once for storage at -20°C. Repeated freezing and thawing will cause the sample to degrade and the sample DNA cannot be stored. Shake or mix vigorously to avoid fragmentation of long DNA fragments. We do not recommend you to send DNA samples, because the length of DNA directly affects the length of phasing. DNA samples can be damaged in transit.