As your students move through high school and begin college, they will find that many universities now are VERY specific in how assignments are to be prepared and submitted. They typically give the students a specific site and a set of instructions on how to format and turn in assignments. If you do not adhere to the format, your assignment is rejected (or major points are subtracted). If you try to submit in a different manner (turn in a hard copy or send as an e-mail attachment), the paper will not be accepted. They also set the site to shut down at midnight on the due date so that late submissions are impossible.
At the beginning of a course, the university will include a "technology understanding statement" making students aware that internet outages, hardware malfunctions, etc. are not accepted as excuses. They suggest having an alternate computer available, and having additional internet access to your primary source in the event of problems. They also suggest backing up and saving material frequently (and to use multiple formats to save your work).
When we decided on written projects for our band classes, we replicated this system in order to help the students prepare for the future. We asked them to submit their work as a "Google Document" to the specific address for their teacher of record for their class. We did not refuse to accept any assignments, nor did we shut down the site on deadline days.
We received several hard copies of assignments, had some sent as attachments to email, and even had one with the assignment written as the body of an email. We had around 10% of the assignments turned in late. We had one "my flash drive broke".
As you review your student's grades, please understand that the process was explained clearly, instructions handed out far in advance, and reminders given for weeks before each due date. It becomes the responsibility of the student to meet the requirements and deadlines. We want them to be able to succeed in the future, and we hope to assist them in understanding how things will work as they continue their educational journey.