Clarify size limit for uploaded videos #2194

Job	Run time
cppcheck	5m 49s
min features with gcc	2m 10s
min features with g++	2m 45s
code formatting check	17s
min features with clang	2m 34s
max features with gcc	3m 38s
max features with g++	1m 54s
max features with clang	3m 34s
max features with clang and AddressSanitized	3m 3s
max features with gcc and DEBUG	2m 15s
max features with gcc for 32-bit arch (legacy OS)	2m 0s
max features with g++ for 32-bit arch (legacy OS)	1m 43s
max features with clang for 32-bit arch (legacy OS)	2m 16s
	33m 58s

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