The folder is not the problem, the upkeep is
Nearly every teacher who buys ChalkHandoff already had a sub folder. It was built in a burst of September energy, it was good, and then the master schedule moved, two students transferred in, the projector password rotated, and nobody went back. The folder still opens. It just describes a room that no longer exists.
Structure is what makes upkeep small. When the seating chart, the bell schedule, the login list, and the medical alerts live as fields rather than as paragraphs inside a document, updating them takes a minute and every banked day updates with them. That is the whole mechanical difference between the two approaches.
What a stranger can do with a link at 7:45
A sub who arrives with a low battery, no district login, and eleven minutes before the bell needs paper. Sharing a document assumes access, a working device, and a reader who will scroll. A pack assumes none of that: page one orients, the middle pages run period by period, and the last page tells the sub where to leave the keys.
This is also where the privacy line sits. A shared folder tends to accumulate everything, including gradebook exports and notes that a substitute has no business reading. A sub facing view carries the allergy, the seizure protocol, the pull out schedule, and the accommodations that change how the day runs, and it leaves the rest alone.
What it takes to make the Drive approach work
If you would rather stay in a shared drive, copy the discipline instead of the tool. Use one folder per room with a dated file name, put page one in a fixed format, regenerate the seating chart after every schedule change, and check every login twice a year, in October and again in January.
Then test it the way a fire drill gets tested. Hand the folder to the teacher next door in November and ask whether they could run your Tuesday from it without calling the office. Most teachers who run that test once end up either fixing the folder that week or deciding it is not the kind of thing they want to maintain by hand.