Getting stuck with the merging and your Google account is in a language different than English? try this:

[leosanab]

If the GPTH tool won't work for you, it may be because your Google Photos is in a different language than English, which might also mean the tool is coded for English only. But fear not! There's a workaround for this. Simply check this guide from Google, retry to request a new export from Google Photos and then try it again with the same instructions. It might work!