@Clindamycin
I was also in a similar situation and even i have submitted the case specific enquiry and attached the LOE along with the request and i have received a response exactly after 7 days.
But nothing to worry, its just a technical issue but documents are getting uploaded but not visible.
Below is the email that i have received from IRCC
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Good day Siva,
Thank you for contacting Immigration, Refugees and Citizenship Canada (IRCC).
We are pleased to confirm the reception of the following document:
- Letter of Explanation.pdf
We have forwarded it to the responsible office for their consideration.
If further information is needed during the processing of your application, the responsible office may contact you.
We hope the information provided is helpful in assisting you with your enquiry.
We would also like to suggest the following online services that might be helpful to you with any immigration, refugee and/or citizenship future requests:
Sincerely,
James, agent 4113
Immigration, Refugees and Citizenship Canada
https://www.canada.ca/en/services/immigration-citizenship.html