To the best of my understanding the ability to re-score miss-keyed responses is a feature request (https://ideas.digitaled.com/) and not part of the current release. Also, and this part is something I am not 100% sure of, if Student A attempted the original question they will see the original question in their gradebook. While if Student B attempted the "revised" question they will see the "revised" question in their gradebook. It would be far more confusing if everyone saw the revised question, even though half of them were graded with miss-keyed answer. To this end, I would recommend using the "edit question comment" field when manually correcting the miss-keyed student responses.
I am having a problem entering one of my classes. When I try to enter it a Authorization Error pops up saying "You appear to have launched another resource that has restricted your access to this one. Please launch this resource again to continue." What can I do to fix this?
The way I would diagnose this is by editing the moodle code to print out the http packet that you get back from TA. It will be sending correctly from TA but I think at some point the packet is being changed on its way to moodle. The best way to check this is to print it out in the packet in the service.php file on the moodle server - this is the place the grade gets sent to - http://localhost:8888/moodle29/mod/lti/service.php. Of course this means you need access to a non-production version of moodle to test. Part of the problem is recreating this problem on a server where you have diagnostic control.
One solution to this would be to hold the answer in a variable. For example to calculate power = energy/time we could use variables such that $P = $E/$T. In the response area (assuming you are using numeric) you can then set "Required with" to "absolute accuracy". If you are using randomisation such that $P would be to more than two significant figures you can use the command "decimal(n,x)" in the algorithm section where x is the input and n is the number of decimal places. In this case it would be decimal(2,$P).
It seems that they have an iframe embedder feature, so it's pretty much copy-paste of their source code into source code of a Mobius question. I've attached a TA question with one of their demos as an example: Example.zip
I have been able to search for content in the Cloud in Maple T.A. 2017 - e.g. searching for Distribution gives any folder with 'Distribution' in the title, as well as questions containing 'Distribution' in either the title or the question text. Can also use * to search the start of words e.g. searching Geom* will give you results for Geometry and Geometric. However I'm afraid I don't see the Fourier series folders you are referring to (either in the list or by searching).
EDIT: Also if you are looking for a specific topic, try the "Subjects" list under Maple Cloud, instead of "All Content Types".