how merge fastq files for MetaSPAdes

Hi,
I have a list of paired fastq files and i want to merge them in a single file to assembly them all together with MetaSpades. I try concatenate tail to head, but i can’t input it in metaspades.
Best

Welcome, @K_Durand !
Which options are you using to input your data?
Note that Select file format has three options:
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