Hi @hunterganhs
The [https://psref.lenovo.com/syspool/Sys/PDF/IdeaPad/IdeaPad_Duet_5_12IAU7/IdeaPad_Duet_5_12IAU7_Spec.pdf|specifications] show that the memory is not upgradable as it is soldered onto the motherboard.
You can upgrade the storage if you want though. Here's the [https://download.lenovo.com/consumer/mobiles_pub/ideapad_duet_5_hmm.pdf|hardware maintenance manual] that will help.
It details the procedures on how to replace all the removable components from the laptop.
Here's the [https://pcsupport.lenovo.com/ec/en/products/laptops-and-netbooks/ideapad-duet-series-laptops/duet-5-12iau7/82tq/parts/display/compatible|parts list] that may also help. Click on ''Select Commodity'' and then select the part that you need. A list will open showing the Lenovo part numbers for the part. Search online for the ''part number only,'' to find suppliers that suit you best.