Third check: the foreign country or receiving authority
A validly issued e-Apostille from the competent authority of a Convention member state carries the same formal validity as a paper apostille, and it cannot be rejected simply because it was issued electronically. That does not stop the receiving authority from having its own requirements for how the underlying document must be presented, or about its content, translation or validity period. That formal validity is, in any case, a matter of international law, not a guarantee that the office that will ultimately receive your document abroad (a civil registry, a bank, a notary's office, a university, a consulate) has the procedure, the portal or even the internal policy to accept an electronic file or a document notarized over video instead of in person. Many offices still work exclusively with paper and require the physical document with the physical apostille attached. Even though a valid e-Apostille cannot be rejected simply for being electronic, practical difficulties can still arise if the receiving authority requires a specific presentation format for the underlying document or has no clear procedure for remotely notarized documents. This check is the applicant's responsibility alone: contact whoever will receive the document and ask, in concrete terms, whether they accept a document notarized through RON and apostilled electronically before you start the process.
A practical example: someone living in Spain needs to grant a power of attorney so a representative can handle a transaction in Colombia on their behalf. Instead of traveling to the United States, they schedule a RON session with a notary commissioned in Florida, and the document is notarized electronically. Before signing, they confirm two things separately: with the Florida Department of State, what format of the remotely notarized document it can apostille and whether an e-Apostille route is available for that case; and with the authority or notary's office in Colombia that will receive the power of attorney, whether it accepts a document notarized through RON and what form of apostille, electronic or printed, it requires. Only after both confirmations do they sign.