Here are the possible causes and solutions.
Changes have been made to the manual
There may have been changes to the manual, such as someone already submitting an approval request from another device.
Please check the following and try submitting the approval request again.
Synchronize the manual
If the manual may have been edited in the web browser version, please synchronize the manual to incorporate the changes.
▼Please tell me about "Not Synchronized" in the mobile app
https://help.teachme.jp/hc/en-us/articles/12095601263769
Update the app
▼How do I update my app?
https://help.teachme.jp/hc/en-us/articles/900006442623
The number of characters in the cover or steps exceeds the limit
If the number of characters exceeds the limit, you can save as a draft but cannot submit for approval.
Please check the following and try submitting the approval request again.
Check the character count
If the number of characters in the cover or steps exceeds the character limit shown on the edit screen, please adjust the content.
Related:
What is the character limit for the title, description, and other text fields?
https://help.teachme.jp/hc/en-us/articles/900006444683
How do you count the number of characters?
https://help.teachme.jp/hc/en-us/articles/10268480807961
If the above methods do not resolve the issue
Please contact our support team (support@teachme.jp).